Of course it's very arbitrary, very subjective. Having said that, there seems to be a pattern, and not equable. Four offensive player are in for every defensive player. Not one dedicated punter is in (Blanda does not count.) Coaches: The SB victories for sure. Maybe 15+ seasons - making the playoffs 85% of career, with one SB victory or three SB appearances. QBs: Similar SB criteria as coaches. No SB victories, must have passing stats rivaling all time greats. At least five Pro Bowl invites. RBs: At least 10,000 yards. At least five Pro Bowl invites. etc.