I think the idea that there isn't a good pool of HC candidates is folly. There will always be someone available in the ranks of football coaches that would make, and one day WILL make, a fantastic hire and successful HC. Just gotta find them. Also just because fans/media don't have insights into the potential coaching pool does not mean that football teams don't have insights.
But I think the writing is on the wall, MLF will be coming back whether it's on a lame duck contract or an extension. If GB was going to fire him he'd be fired by now. There's still a chance they move on, obviously, I think it's just a very small chance at this point.