If Clifford goes down again, and again, they have no one ready to step in, then shame on them. With that said, Villeaux should be more than capable to take over at this point.
I think we all agree PJ is #1 on this list, which is probably why his name comes up so much when the questions around recovery come up. Him not being ready is almost the same as him going down. There really is no #2 DT at 1-tech who matches what he does.
#2 feels like OT as we don't seem to have depth there vs IOL spots. Fashanu would be a big loss.
#3 - Jacobs makes sense on the list due to the lack of depth on LB.
#4 - I think Brown as he is critical to the cohesion back there. We do have depth, but there would be fall off without him.
#5 I can see Clifford, but he has been hurt every season so far, so evidence suggests he gets hurt again. Hopefully, we do not play him at 50%, and CV looks like he can step in and play better than an injured Clifford. A badly hurt Clifford (i.e. the Illinois version is not better than CV, DA or BP. Right now, if SC were to get hurt where he can play but not at his best, I would go with CV immediately.