Cousins and Towns weren't particularly close as college contributors IMO.
Karl was nasty by the end, but I'd still take March Cuz over March Karl, and October Cuz >>>>>> October Karl.
per 40:
Cuz: 25.8 and 16.8
Towns: 19.5 and 12.7
Towns significantly better on blocks and slightly better on assists, Cuz significantly better on steals, both shot the same FG% and the same number of fouls (this surprised me - I thought Cuz fouled more for sure).
Cuz was just as dominant on that '10 team as Wall was. Wall got all the hype, but Cuz had one of the best per-minute seasons of any big in CBB history - he'd have been Beasley-esque if he didn't have to share a backcourt with Pat - he just had too much foul trouble (but again, not more than Karl).
So to me, it's
1. Davis
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2. 3. Wall/Cousins in some order
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4. 5. Towns/Knight in some order, but I could also see arguments for MKG, Jones, Randle, Willie, Noel