Duke and Arizona both played 4 teams this year: Stanford, Gonzaga, Utah and Wisconsin.
Don't have Stanford games, but have the other 6 (Arizona and Utah actually played twice, but I only have 1). At some point I'm going to put together similar plays of Winslow, Johnson and RHJ on both ends of the floor as a comparison.
For now I would ask to consider, that Winslow played mostly vs PFs in a spread out offense, while RHJ was defended by SGs/SFs and faced a packed paint, so what you saw wasn't a true representation of their abilitites. Plus
------at the rim FG%--2pt J%--FT%--FTrate
JW-------66.7-----------26.1----64.1---43.8
RHJ------72.3----------32.8----70.7---74.5
As for WCS impending failure you miss the fact, that
T-Rob failed, because his biggest assets were being fast and jumping high with running start. He had only decent length, bad quickness and bad no-step jumping, which sounds like D-Will as well.
Ben was playing as SG for only a couple of years and Stauskas was an average athlete.
The only real comparison could be drawn only to T-Rob and Willie has 7-8 inches more in no-step vertical, including 5 inches standing up with stretched arms, and big advantage in quickness, which is helpful for that defense thingy. Another area, where no-step vertical and quickness/agility helps, is finishing inside. That would be enough to keep WCS on the court at first, while he improves his skillset.