Bk hasn't even started interviewing DC's at this point.
Most good DC's worth anything are playing in the bowl games, and they're not going to risk angering their current boss by interviewing for a job that they may not get while preparing for a bowl game.
It needs to be managed and done discretely, but because of all the bowl commitments, plus recruiting commitments, it's hard for these coaches to have a lot of time to interview right now.
On special teams, if BK decides to fire him, he may not be gone until after recruiting. I'm not sure when he plans to do any "firing."
Mike