It depends on how many starters they decide to move to the bullpen.
There is a good argument to be made that Ober should move to the bullpen to regain his lost velocity and the effectiveness that comes with that velocity. He didn't have the stamina to maintain his fastball last season. Put him in the bullpen and he could be the closer.
Festa should move to the bullpen. He's never had the ability to put up a lot of innings as a starter. The thoracic outlet syndrome means it makes sense to limit his innings. If his stuff plays up at all he could replace Jax.
Prielipp should also move to the bullpen to keep him healthy and increase his effectiveness. He could be an all-star in relief.
Raya is the final arm who has a future as a reliever, though I think he'll need more time in AAA to figure it out.
That leaves Lopez, Ryan, Bradley, Woods Richardson, Matthews and Abel for the rotation with Morris, Rojas and Culpepper for depth.
Bullpen would be Ober, Festa, Prielipp, Topa, Funderburk, Sands and Orze with one spot open for Raya/Klein/Ohl/Adams.