I don't think it's a given that Fagan won't have enough minutes to keep him around for next year. Skogman is a project and while Hardnett is quickly improving he has a ways to go before he looks like a starter. It's easy to forget that Fagan looked pretty good in very limited minutes last year. At this point it seems to make the most sense to redshirt this year and keep him at 2 years of eligibility left.
Fagan and Hardnett in a rotation at the 4 spot with Mballa/Bertram at the 5 with Skogman playing minutes as needed could make this a pretty strong front court next year.