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Bingo.. You nailed some of it.
Crowder was trained by Zach Thomas to interpret the offense and make the corrective moves. Lots of the people on here just looked at his tackle count, zero sack count and arthritic knees but one of his biggest strengths was his high football IQ interpreting the play. That is why the defense seemed to play better with him.
Who knows? Maybe Burnett will make progress...
The biggest dissappointment so far has been Karlos Dansby . . . he was supposed to fill those shoes while Burnett replaced Dansby as the primary cover backer. I would venture to say he has been the biggest disappointment on this defense so far this year.