That hit piece Haney wrote mentioned defensive philosophy squabbles between the defensive coaches. If Martinez didn't agree with Shoop then could have been a problem. Hard to be a good DB when your positional coach and DC are telling you two different things.
It was as though the foundation of his DB coaching was "I want you to let opposing WRs run right past you and, whatever you do, don't you ever, ever, turn and look for the football......"