For the genuine life of me, I don't see how that statement can be made.
Having a strong cordon is as, if not more important to a team as having a strong tail.
But putting that aside for just a moment, if we're comparing the value of two players and they are tied on primary skills and one is decent and one elite, that doesn't matter?
I don't know where this argument that lower order batting or even reserve bowling is so much important than having a strong cordon has come from. And I don't know how you can watch any test match and the value isn't immediately evident.
When building a team all three factors to varying degrees have to be factored in, one is literally built in the the team format with an batting all rounder slot for an additional bowler. No one wants a totally useless tail, with some resistance being welcomed to assist with building totals. Re the cordon, each innings starts with 3 slips and a gully, and most of fast bowler's and a healthy amount of spinner's wickets comes from catches taken behind the wicket and is immeasurably vital to most bowlers success.
So this not comparable argument is so very far off is crazy.
And I don't care who it annoys, but let's have this discussion again.
1. Team success.
If we did a couple lists of the best teams since WW2, there's a few things they all have in common were aggressive middle orders, really fast and skilled bowlers and elite catching. Conversely there's never been a correlation between "great" lower orders and elite teams, partially because teams that have heavily relied on their lower order tends not to be very good, at least not having a reliable middle order. I will continue to ask if those great Australian or WI teams would have traded out their elite cordons for a Pollock or Imran quality bat in the tail. Not saying they wouldn't have taken both, but wouldn't trade their elite cordon for it. I can with confidence say that neither team would have been successful without those guys they have in the cordon.
Bowlers success.
2. Your pacers, especially in SENAW are ultimately only as successful as their collective cordon. Look back at the careers of Lillee, Hadlee, the Quartet, Marshall, Ambrose, McGrath, Steyn, and it's obvious how much they benefitted from having elite guys back there. All of them had elite cordons with specialists at 2nd slip, the premier position. I would like to single out one of them to say how elite their support was, but all of them were well stacked. Guys like Chappell, Coney, Greenidge, Hooper, Waugh / Ponting, Kallis consistently converted half chances and were worth their weight in gold.
From my perspective, I don't see how there's any argument to positional value and how the roles aren't comparable.
Even with regards to Dravid, he was key to two spinners success as well, as was Taylor / Waugh / Hayden to Warne and Jayawardene to Murali, equally as vital for the spinners. Those 210 catches are all direct wickets, each dropped one a missed opportunity.