I mean again you've got Heide, TKR, Jacobson and Burgess. That's it at the 4/5. And Burgess doesn't seem capable of double digit minutes right now.
I don't think Burgess or Heide is averaging 20+ minutes at the 4. Jacobsen at the 5 means some of those minutes at the 4 go to TKR, possibly a decent chunk. I don't think Burgess is your back up 5.
Painter clearly wants a lineup with Jacobsen at the 5. That means TKR at the 4 some, and then at the 5 some.
So I think there's at least 10-15 minutes available minimum for a senior or grad big man.
Where the real logjam is, is at 1-3 IMO. So if we are going to bring someone in, I don't think it's at point guard or shooting guard, we have two deep at each position as you've noted.
Put another way, we've lost one big man this season and we are looking mighty thin inside after TKR and Heide. Does that strike you as a position we are overloaded at?
So barring injury, to me, IF we bring someone in, and obviously that's the whole point of this hypothetical discussion, ifs, then the most likely spot isn't at 1-3 positions.