It could be.
I remember when Lovie Smith became the HC for the Bears they had a rash of hamstring injuries to their players and Smith stated that he knew it would happen because it happens every first year he takes over the team or the defense due to the way he trains.
That wouldn't bother me too much if that was the case. Although Woicik had a lot of injured players in New England as well, but IIRC, they were mostly cornerbacks which I believe is the most injury prone position in the NFL.
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Legend of Kirby Dar Dar Blog