PGs take time to develop in Beilein's system and Centers usually take time to adjust/bulk-up to B1G physicality.
That all being said, I think it would be wise for Michigan to use a scholarship on a Center or Tall-Wing (6-8+) in the 2018 recruiting cycle. For the 18-19 Season UM will be looking at the 4th year of eligibility for both Wagner & Wilson --- even if Teske, Livers, Davis all pan out, it's a good time to introduce depth into the program to start strength training & learning the playbook.
I understand the desire for athleticism on the perimeter, but starting in 18-19 UM will have Simpson (2yrs elig), Matthews (2yrs elig), DeJulius (4yrs elig), Poole (3yrs elig), Brooks (3yrs elig), Watson (2yrs elig) --- plus 1 other Class of 17 or Class of 18 scholarship slot for a wing/2-guard. That's a log jam of bodies with multiple years of eligibility --- especially for a Coach who like to go with a 7/8 man rotation.