https://www.si.com/2014/06/19/mike-p...d-browns-coach

“It's your job as a coach to keep throwing stuff at them and at some point, you'll get feedback,” Pettine says. “But you're going to have teams, like the 2006 Ravens defense, that had almost like an infinite sponge. We could have 60 calls up on game day, it doesn't matter. Those guys Ed [Reed], Ray [Lewis], Adalius [Thomas], Jarret Johnson—those guys could handle anything you threw at them. If your team's cumulative sponge isn't big, then you might have to back it off a little bit. I think sponge-wise, we're pretty smart. We already have some advanced stuff very quickly. But there's some coaches that each year, teach, This what we run and that's it. They don't ask more of their guys. To me that's coaching. If your guys can do more and you’re not doing more, that's on you. Or if this is your norm and you have a pretty good team and they're just not mentally there, then [expletive] pare it back a little bit.”
So he is aware of the challenge. Lets hope Seattle taught him how to deal with it when the sponge is small.