The quick answer is that I would cut Sopoaga and bring everyone else to camp if they could pass a physical.
I'll answer the question, but I think your analysis is backward. If there were a logjam, it is you who would be able to name the 6 players we absolutely had to keep and wouldn't want to cut. Even then, factoring in the likelihood of one injury in camp, we still wouldn't have a logjam.
I have already indicated that if everyone is healthy, your first five would likely make the 53, unless one of the backups beat out Armstead. I am fine with a core of Wilfork, Kelly, Jones and Siliga if all are healthy.
A logjam suggests that it really matters if the bottom four don't make the team (Forston, Vellano, Grissom and Sopoaga).
There is a very real possibility that at least one of the injured will not be on the 53, in which case we will need a replacement.