This is the Patriots and the number of snaps you get is a great indication of how you are playing and where you stand in the depth chart. Based on this week, which looked like a game we would need him (heavy run team and an injured Hightower), he didn't get a look. I don't think he is even seeing seeing many ST's snaps.
In my mind it is HAS to be due to a drop off in his athleticism due to his injuries. Up to that time May has been a key element in the Pats D, and in my opinion massively underrated by the media and fans. He had even been involved in more "big plays", the big complaint of media and fans, in recent years.
It isn't his original athleticism. He was a 4.5 sideline to sideline player for the first 7 ears of his career. It isn't his intelligence or leadership, since he was an obvious presence on the team right up to the superbowl. It isn't his age, since he's only 29 and should have 2 or 3 more seasons near his prime.
So the only reason for his lack of playing time and his position on the depth chart is a drop off in playing ability due to his coming back from an injury.
Thus we are left with 2 questions that need to be answered. Can this drop off be turned around with time or is it permanent and he's done? Second, if it can be improved, why wasn't he simply put on the PUP while he heals?
I'm speculating that the Pats felt he would get back to what we've come to expect faster by not being on the PUP and knew in advance we wouldn't be playing 3 LB's much, so gave him a roster spot. If they prove to be wrong and he can't come to full strength before the end of the season, they'll either release him in March, or give him a shot to come back on a heavily incentive filled renegotiated contract.
BTW- I'm glad Bostic has been seeing some success on special teams, but this guy was a starter for most of his career and it's been with the team for a few weeks now. Anyone else a bit surprised he hasn't seen any defensive team snaps so far?