The only real metric here is the number of man games lost to starting players. If you're going to mellow it out by somehow injecting the record, then it's not a real measure of the "healthiest" team. The Bills are far from the 6th "healthiest" team. What they are is leading the league in roster depth. If you line up the games lost to starters and then look at the records, I bet the Bills would be #1 by a wide margin. Unfortunately, I can't find any injury data on a league-wide basis, broken down by team.