If Butler is his friend and he was concerned enough to ask about it (I read DA as saying he asked the team that question but not Butler that question), then why hasn't Butler told him the reason (Butler knows the short answer here - he just isn't offering it while playing the victim and not-so-silent good soldier after his big contract - and I like Butler, even if he screwed up here)?
Neither DA nor Butler are returning, so I would really like to hear actual answers rather than the "he would have helped" crap (try "he was sick, and was over that by Tuesday that week but was caught doing a line with a coach's wife after curfew on Friday so got benched" - How hard is that to write?). DA offers nothing in the way of actual observations as to whether Butler was practicing and healthy and when. The coaching staff will not answer this (if it is to spare Butler from public discussion of a disciplinary issue, then these players are being POS's for not explaining that knowing the team won't respond and clarify while taking shots publicly).
If Butler screwed up and violated team rules and got himself benched, then with this information we can lament the fact the Pats have and enforce rules in this loss and debate whether this was the time to let that slip (again, there is precedent in Welker for sitting a player for a series for a violation, but not a whole game). Barring the unlikely receipt of an accurate statement from a former player or current or former coach, this X-Files "smoking man" theorizing rolls on, with the coaching staff getting the scorn (they deserve it if sitting him was petty and vindictive, not if it was reasonable).