My opinion is worth about as much as high-quality roadkill on this, but I'd say:
1). If Hegarty is A-OK, then he is center certainly. Coach liked his progress on everything towards season's end.
2). If #1 is true, then ZMart, Watt, Lombard, and Hegarty start, but who else?
3). Talk seems to favor NMart, but Ronnie Stanley is a true force according to what we hear as well. This coinflip could hinge on whether Coach wants to slide Lombard into Right Guard or not. Opening a tackle position might make a Stanley startership more appealing --- even NMart looked to be more tackle than guard for a long time.
4). Whatever goes on, the one of NMart and Stanley who is not starting, combines with Mark Harrell and Conor Hanratty to give the "eight" that you really need to keep the frosh from burning a year. Since Heggie is still available [and who knows about Nichols], we have even greater chances of not having to burn any years. But if Matt can't go full out, and there's no Nichols, EE Michigan Mountain might still have to play.