Smali seems to be on a roll. Though I believe that being a good slipper adds value to a player and a side and when I do my drafts and A.T. teams I always try to include 3 good slip fielders, contrary to.what Smali I do not consider them to be all rounders.
Now, as England showed today and in the past, it is unwise to go into a test with just your front line bowlers and a legitimate fifth bowler, ala Sobers, Kallis, Weekes, Watson, Waugh ect is often required dor optimum team balance and while a bowling all rounder gives your batting depth (Imran, Hadlee, Broad ect) unless he can consistently bat in the top 6, doesn't offer you that 5th bowler to rest your front line seamers or give you that elusive break through. Miller and Botham were the exceptions as true all rounders, but Botham dropped of drastically and Miller was inconsistent with the bat and often under used with the ball. Hence I rate batting all rounders higher and more important, and additionally if you are relying on your #8 to save you match after match you have bigger problems.
Hence to smali's point, I do find a great batsman whos is great slipper (Lara, Ponting, Weekes) to be almost or just as important to a side as a bowling a/r, a batsman who can bat, bowl a bit and offer me a great slipper (Hammond, McCabe, Kallis, Sobers, Simpson, Chappell ect.) to much more important and crucial to a side than a bowling a/r.
So yes Kallis is to me just behind Sobers, though Imrans captaincy makes it a virtual dead heat.
nb: Not looking for a fight.