I see why you might think that, & it likely is a WAG..but imo, it seems to me BoB has been reluctant to the pull the trigger on fully getting himself behind Mallet since he arrived. It took for Fitz to turn into a full on turd before BoB even gave the kid a chance & even after showing competence in the Cleveland game, BoB still felt the need to go out and not only get a guy like Hoyer in the offseason, but actually pay him more to make sure he got him and open up the job to competition. Now, i'm not saying Mallet should've just been handed the job, but he should've at least been given the upper hand. So far, it doesn't feel like he has the upper hand. It feels like BoB is waiting for something from him.
Take that play from the hard knocks episode where apparently Mallet thought a qb sneak was called and bob was telling him like "c'mon dude, you know we wouldn't call that there....correct it etc..." Mallet's response was "I'm just trying to do what you tell me.." Instead of thinking it through and calling something more appropriate/asking for clarification on the play... or a timeout..or something...just 1 play but it shows the disconnect. Mallet's out there acting like a robot instead of being an extension of the coaching staff out on the field...like all the great HC-QB tandems. I agree with you that they didn't tell Mallet to be looking deep and become ultra agressive, but what i do believe is that Bob is looking for a little bit more from him in terms of helping exploit things he sees on the field so that Bob can be more agressive & stretch the field.