If Rudy is up there because of objective criteria, so be it. But, as good a pro as he is, Rudy accomplished doodly squat here compared to Ben, Caron and frankly many others (Boone, Thabeet, Adrien, and you can make a case for KO). His numbers were good, and his potential for the NBA was enormous, but in terms of making the team better and leading it to new heights -- you can't even make a case for Rudy.
Did Rudy really do that much worse than Caron?
Freshman year: 2001 vs 2005:
Caron: 15.3 Pts, 7.6 Reb, 3.1 Ast, 20-12 (8-8)
Rudy: 11.8 Pts, 5.4 Reb, 1.5 Ast, 23-8 (13-3)
Rudy went to the NCAAT and went to the second round and won a BE regular season trophy
Sophomore year: 2002 vs 2006:
Caron: 20.3 Pts, 7.5 Reb, 3.0 Ast, 27-7 (13-3)
Rudy: 15.2 Pts, 6.4 Reb, 2.1 Ast, 30-4 (14-2)
Both went to the Elite Eight, both won a BE regular season trophy. Caron's team also won the BET.
Rudy's individual stats were lower, but his team's accomplishments are pretty close to Caron's. Butler has a BET trophy, but Rudy went to the NCAAT twice and picked up an additional BE regular season trophy.
Yes, Caron took over more than Rudy did, but it's not like Rudy's teams actually accomplished less.