If Ray Rice had returned for a senior year, and gotten around his yearly average of 1700 yards, he would have got the record for NCAA D1 all-time career rushing leader. Rice got all his yards, and 50 TDs (49 rushing) running against defenses that were 100% geared to stopping him. Opposing teams always said their first goal was "stopping Rice" (but they couldn't) Not even Carroo has had to deal with that kind of scenario.
This.
And Anthony Davis, as one of the 5 best OL in the country while he was at RU.
Sanu was amazing, and played on a team with literally NO OTHER play-makers, including at QB. Was triple covered almost every play, yet still caught over 100 passes his last season. Plus he was the entire RU offense as a Sophomore when he ran the Wildcat offense so often for RU.
People forget that Eric Foster was a 1st team All American his last 2 seasons.
Khaseem Greene won the Big East/AAC Defensive Player of the Year TWO times in a row (though he was only "Co-" as a Junior).
Coleman could not be covered his Sophomore year, when he was healthy - but that was his only great year ... Carroo is better, by a margin. Britt was GREAT, but I think Carroo may be passing him, if he has not already.
Leonard is a different beast: More a leader and an inspiration than Carroo, and the best FB in the country his Senior year, but Rice was the better running back, and barring injury, Carroo willpass Leonard as the better college player. Leonard would have been better if he had a better OL blocking for him his 1st 2 years ... but he needed a good OL.
I would still put Davis and Rice ahead of Carroo, though maybe by the end of the season I might be persuaded otherwise. And I would put Foster, Greene and Britt on similar or close level.
One last name: Where to slot Battaglia? An absolute beast at TE.