I know its speculation, but I'm not a fan of the QB saying anything to anybody about his feelings on Mike Sherman. Take accountability for your own performance young man and keep the in house stuff, in house. Throwing your college coach and Offensive Coordinator, the guy who placed you in the system to get you drafted top 10 in the NFL draft, under the bus is not something you air out to the media.
Tannehill has held himself accountable. Has Sherman? Anyways, just because one of Tannehill's confidants sqeal to the media, it doesn't mean he doesn't hold himself accountable. Besides, this is another media story with no actual sources so we can't really pass judgement here because it might not have actually happened.