So, maybe this is one of my blind spots in the rules, but I keep reading about the brilliance of McD taking a timeout after the Steelers got liked up on the play Poyer got his interception. This isn't the first time I've heard praise for McD using a timeout just because he wanted to see what the other team was putting out there. Now, it is obviously a smart tactic; I get all of that. My question is this: couldn't the Steelers just sub out different players after the timeout and totally nullify what he was trying to do? Are they not allowed to sub players if we call the timeout?