Why hasn't Paul Alexander been interviewed for HC?

[*PhilHos*]

For the last few years, or coordinators and assistants have been interviewed and some of even gone to other teams in usually a higher position with the new team. Considering this AND considering that our OL is viewed as one of the best in the league, why hasn't PA interviewed as HC?

Yes, I know what most of US think of the dude, but still it makes me wonder why his name is never out there for HC consideration.