He said straight up that Williams doesn't have arm strength and he thought his guys could undercut some balls, which is obviously what happened. Now that it's clear opposing DC's are thinking this and it's proven to work, we can expect to see opposing teams do this and it will be up to Williams to actually get some more power on his throws as many people claim he is capable. That's assuming he stays the starter.
I thought Perry looked better than Williams and I'd like to see what Martell can do. Season is essentially over already, we need to at least figure out our QB room for next year.