In 1999, Kallis's first great year as a batsman each of Gibbs, Kirsten, and Cullinan did very well. Cullinan even got more runs than Kallis.
https://www.thecricketmonthly.com/db/STATS/BY_CALENDAR/1990S/1999/TEST_BAT_MOST_RUNS_1999.html
Kirsten and Cullinan again averaged 40+ in 2000.
https://www.thecricketmonthly.com/db/STATS/BY_CALENDAR/2000S/2000/TEST_BAT_MOST_RUNS_2000.html
In 2001, Gibbs did better than Kallis whilst both Kirsten and McKenzie averaged 40+
https://www.thecricketmonthly.com/db/STATS/BY_CALENDAR/2000S/2001/TEST_BAT_MOST_RUNS_2001.html
You make it sound like Kallis had Border-esque support before he was part of the strongest batting lineup in the world. That's simply not true. SA also had strong tails for most of his career though. The tail always having to dig SA out is a narrative that's years out of date by this point in Kallis's career and I suspect you're aware of that. So Kallis being forced to be dour is simply not true. That's just the way he batted.
Bad thing people pretend Kallis had it especially difficult as a top order batsman
Since you really really want to do this.... and your ignorance of SA cricket is astounding.
Lets get some things straight here. Firstly all I`ve ever said is that Kallis was the lynch pin around which they built the entire SA batting unit. It was the reason he played like he did and until Kallis came along SA did not have a stable top order in anyway shape or form. You retroactively trying to talk about some very good SA players shows how little you do not understand what was happening in SA cricket and how those players careers where literally influenced by Kallis's arrival. People like yourself talk about the SA batting line-up and say it was not as bad as Australia's in the 80s but the situation for SA was worse. By Mid 80s the Australian batting line-up started producing what would become some top level players still struggling but importantly they had a FC system and players with international experience to help rebuild their team in the 80s.
SA started playing Test cricket again in 1992 after readmission; behind the curve. In that time we had one batsmen who avg above 40 and he did not do that for SA, with Wessels avg 38 between 1992 and 1995. By 1998
no SA batsmen, including Cullinan and G. Kirsten, both of whom had been playing since '93 avg above 40 in the SA batting line-up. SA entire test team was based on jobbing batsmen, some good allrounders and some great fast bowlers. Batting deep and hoping the bowlers could do the rest.
Officially Kallis started his career 1995 age 20 (played 7 test between 1995 and 1997). But really starts his full career 1998 (age 23), batting at no 3:
Between '98 and '2001 he averages by year:- '98 Avg: 34.13; '99 Avg: 69.16; '00 Avg: 48.75; '01 Avg: 70.01 - In '01 he reaches No1 allrounder; and is considered SA's best batsmen followed closely by Cullinan, Cullinan retires the following year. Kallis gets moved to 4 to replace Cullinan.
In that 4 year period, Cullinan avg 40.23, 71.25, 44.69. 56.67; Kirsten Avg 41.08, 58.33, 41.88, 40.2 Both Kirsten and Cullinan talk extensively about the role Kallis has played in allowing them to achieve the higher scoring particularly Cullinan where prior to '98 he avg < 40. Only other player of significance is Gibbs avg 20.88, 54.66, 25.8, 53.32; mercurial and inconsistent at best, given the opening slot because of the stability Kallis brings at 3.
For 98 and 99 Cronje and Rhodes bat 5 and 6 mostly (avg under 35 similarly for most of their careers) Boucher, Klusener and Pollock (and Boje) are chosen to bat 6/7/8/9 at various periods to try provide a long tail. Rhodes is dropped end of 99 and Klusener is given batting duties at 6.
2000 disaster happens with Cronje revelation. By July 2000 SA are playing in SL having lost their captain and Gibbs. Rhodes is recalled. McKenzie opens with Kirsten. By end of year Mckenzie drops to 5, Boeta is opening with Kirsten and Boucher is batting 6... Cullinan retires 2001. The batting is again needing to be rebuilt around Kallis at 4.
For 2001, 2002 and 2004 Kallis will avg 8+ runs greater than any other batsmen chosen for SA (including Kirsten and Gibbs).
In 2002 Kallis avg 64.18, Kirsten avg 55.57; Gibbs avg 47.61. Smith starts his career avg 45.5. Kirsten has moved to 3 and Gibbs and Smith are opening. Kirsten eventually drops to 5 to try stabilise the lower order before retiring. Kallis is still bowling 15 + overs an innings as SA struggle to find a seamer to support Pollock and Ntini.
Smith becomes captain. Kallis has a poor year by his standards in 2003 avg 49.85 (doing poorly in England coming off an ankle injury). Skipped prior Bangladesh tour. Kirsten avg 74.08; Gibbs 64.22 mostly off the Bangladesh tour. Smith does his doubles in England.
2004 Kallis avg 80.08, Kirsten 40.08, Gibbs 57.76 (skipping the Indian Tour), Smith 46.05. (Gibbs will never avg above 40 again).
During the period from 2000 to 2004 (and beyond) with no Cronje and Rhodes the following batsmen are used in various combinations for the top 6 of SA: Boeta (30.14), McKenzie (37.39), Ontong (19.00), Klusener (32.86), M van Jaarsveld (30.53), J Rudolph (35.43), Zander de Bruyn (38.75), Andre Hall (26.02) and a number of others...
2005 Kallis avg 72.71, Smith 52.01, Gibbs 39.75, Prince 58.00... ABdV is selected. Amla is consistently selected at 3 from 2006. And so starts the narrative to build the team that peaked between 2009 and 2012.
The point here is that until Kallis came along, even good batsmen like Cullinan and G. Kirsten struggled... it was not until the arrival of Kallis stabilising the SA top 4; firstly at 3 and then at 4, that allowed the other batsmen to start scoring runs. By 2000 it was generally acknowledged by commentators, opposing captains and anybody that understood cricket that getting Kallis out was half the job done. The team was built twice around him firstly in '98 and then again in 2001 after the Hansie controversy and Cullinan retirement; eventually leading to 2003 when Smith took over. If you actually look at the rise (now heavy fall) of SA Test cricket it was off the back of Kallis. From 2009 the SA team was considered not to rely on Kallis anymore (rightly) with Amla providing huge stability and ABdV endless talent. But since his retirement in 2013 SA have never been able to replace him and it is easily seen how SA cricket slowly disintegrated after he left because he provided a panacea for many of any Test teams problems.
You want to think that Kallis was not the lynchpin around which the SA batting was built for 10 years that's fine, you think that SA had a fine batting unit without Kallis that's fine. All you do is show you ignorance of SA cricket.