I still think he is gone, but let me make the case for him to stay...
The 2018 draft is extremely big-man heavy. Mostly all mock drafts have Ayton, Bagley, Jackson JR, Doncic, Bamba, and Porter JR all grouped together in some order for the top 6 picks. All 6 of these guys play PF or C. They are the "top tier." Not saying I agree, but the NBA drafts on potential, and they all have more potential than Wendell, however Wendell is better than most of these guys RIGHT NOW.
Wendell would be in the "2nd tier," not really any other bigs in this tier, he then falls in line with Trae Young, Sexton, Bridges, etc. This is not a good situation for Wendell, if he is the SEVENTH best big-man available in a guard heavy league, there is a great chance he goes outside the top 10.
Looking at the 2019 draft, much more friendly to Wendell, the top 5 consists of our 3 stud freshman in some order, along with the guy from Gonzaga. Many consider the 2019 draft to be weak, and not only could it be weak, it's very guard/wing heavy. THERE IS A GOOD CHANCE THAT WENDELL IS THE RARE CASE THAT HE COULD ACTUALLY IMPROVE HIS DRAFT SLOT BY COMING BACK. This for 2 reasons, 1. Again, a weaker 2019 draft, very weak for bigs and 2. He absolutely dominates college basketball next year.