Man, i have to strongly disagree with the bolded part. There were plenty of times last year where he would throw on first down, and then surprise me by throwing again on second down (since most times teams run after throwing on first down). It's probably because we had to throw to keep pace with the opponent, but still.
It seems like you're overgeneralizing here, maybe nitpicking at some bad habits that Trestman has as a play-caller. When I think of predictable, I think of being able to look at a formation and the personnel on the field and guess accurately pre-snap what the offense is going to do, which is something that was easy to do with Caldwell. With Trestman, I might know his tenancies, but I don't know for certain what he's calling on a given play based on formation.