Last year, he was a tenacious defender but basically unplayable on the offensive end between bad outside shooting, bad decision-making, and bad finishing.
This year he kept up his defense while becoming dangerous and disciplined with the ball in his hands. His finishing in transition and his attacking the paint, to either score or draw-and-dish, was exceptional and keyed a number of runs throughout the year.
As I said in an earlier thread, he essentially played himself out of the Final Four last year with a bad turnover against Miami and then didn't play at all against SDSU. He redeemed himself big time this year, including last night.