Fredette who was on All-American teams as a Junior had a ton left to prove his Senior Year and he proved most of it.
What could Yoeli still accomplish? Here are a few just off of the top of my mind that would increase his stock:
-Lead his team to the NCAA Tournament (almost all of the prospects have done this, it is almost the ante to play)
-Earn Conference Player of Year (Many of the Top Prospects have done this)
-Be an All-American
-Be an efficient outside shooter
-Be a more efficient ball handler and passer
You think it is all measurable? Tell that to Jimmer Fredette. Tell that to Buddy Hield. Tell that to Kemba Walker. Brandon Roy, Kris Dunn, Denzel Valentine, Doug McDermott, Frank Kaminsky, Jameer Nelson...etc. You have to dominate, but if you do you can increase your draft stock exponentially.