Well, it's too soon to say definitively that Shanahan's lost his mind, so here's one alternate theory (and I'm not sayin' that it's a good one, just that it
is one):
Shanahan knows that, on this particular day, neither McNabb nor Grossman gives us anything better than a long shot to win the game. As long as some poor sucker is doomed to line up behind that nest of arthritic old hens that is our offensive line, this game is all but lost.
So Shanahan's next priority might be: going into the bye week, how do we best position ourselves to win the next game?
We've already seen that Shanahan likes to keep his players from getting too comfortable. Maybe he thinks that he needs to shake up his QB - and by extension, the rest of the team.
We know Shanahan likes to study. Maybe he's aware of how McNabb responded in 2008, after Andy Reid benched him at halftime in a very poor showing against the Ravens.
Don't remember
this? Against Baltimore, "McNabb was 8-for-18 for 59 yards and two interceptions and a fumble -- a miserable 13.2 quarterback rating."
So Reid benched McNabb for the entire second half, and took considerable heat for his decision. But remember how McNabb played the
next week? "McNabb was 27-for-39 for 260 yards and four touchdowns..." - brilliantly. And suddenly Reid comes out smelling like a rose, instead of like a guy who's dripped a half-pint of pancake syrup down the front of his sweat-stained shirt.
So maybe Shanahan knows this. Maybe he's been pondering it since the very day the front office signed McNabb for the 2010 season. Maybe he's gambling that McNabb stews over his ignominy for the next 14 days, then comes out on Monday night at home and takes his frustrations out on, of all teams, the Eagles.
Or maybe our head coach has lost his mind.