I was having the discussion with some friends yesterday about Chad's durability. He is not a big guy...physically more in the mold of Joe Montana. It seems like QB's need to be much bigger and stronger than in the past. The bigger they are, the more durable.
Look at Drew...he's a pretty big guy, and really hasn't been hurt much at all. Same with Peyton Manning, McNabb, etc. But you look at the smaller QB's, such as Chad, Fiedler, etc., it seems that they are more likely to suffer more with repeated bashings.
If I'm not mistaken, JP isn't exactly a towering giant, is he?