Always pending on performance, but OU should have a decent draft class in 2018. Lot of underclassmen that could have declared came back. The highest profile draft prospect will be Baker Mayfield(which I suspect there will be some Coli fallout if Mayfield goes before Lamar Jackson). Most of our OL will be drafted in the first through third rounds including Orlando Brown Jr. who is a projected first rounder. Mark Andrews could have been a first rounder but he has been consistently inconsistent catching the ball, so unless he has a great year, I see him as a second, or even, third round pick. Jeffrey Mead will be a late draft choice(has size.... 6'5, but mediocre hands)
Defensively, you have Obogonnia Okoronkwo who I project as a third or fourth rounder depending(Jack LB, a little undersized, but has speed that can beat any OT.... Needs to work on coverage.) Jordan Thomas should be among the best CB's coming out in 2018. He had a inconsistent year, so he came back for his senior season. If he has a good season AND shuts down James Washington when we play OSU, then his draft stock is gonna skyrocket. He has the potential to be one of the top 3 CB's in 2018 NFL draft.
There are others that could declare, I won't go into those, but I will say if they have a good year but don't win anything, I think they're gone too.