If they are in this draft, I think the rankings would go Wells, Stewart, and then Mendenhall.
Also, Wells' pro day time was not a 4.32. It was closer to a 4.38, 4.39. He and Stewart are probably similar in speed. I think people should dismiss his 40 time at the combine. He did about 8 or 9 broad jumps before he ran his forties. Scott Wright has said that a lot of GMs and scouts believe this is the reason why he timed somewhat poorly especially since most were expecting him to run in the 4.4 range.