Fizer's hypothetical senior year is a great what-if for ISU. I don't fault him for leaving early, his stock had nowhere to go but down, but gosh how good would that team have been?
With Fizer, Horton, and Tinsley all spacing the floor, I'm not sure Jake Sullivan would have missed a three all year.
I'll also never understand why NBA teams insisted on trying to play Marcus at small forward. ISU listed him him at 6'8" which was probably an exaggeration in all but the tallest and thickest of basketball shoes, but the guy was an absolute unit on the block. He was a great athlete for his size/strength but was still way too slow to guard or drive on NBA small forwards. Everyone at the time wanted their "power forward" to be Tim Duncan- and Kevin Garnett-sized.
I believe Fizer was also practically chronically hurt in his NBA stint.