Coaches don't really withhold. More times than not they go into a game against a cupcake with specific things they want to work on, like let's say the screen game, our or redzone plays, etc and so because of their focus on one area it appears as if they're holding things back because you're not seeing the whole playbook. But that's not holding things back as much as it is using cupcakes to work on specific areas over others.
That said using that excuse for what we saw is bunk because we were very aggressive on offense. We attacked downfield and had multiple formations and shifts...we threw 45 times. We weren't out there trying to play conservative and hold anything back. We just didn't play well and Mac has said as much. Like I said before it doesn't mean we suck and the season is doomed, but just call a spade a spade. Offensively we didn't play well and they have to get better no way around it.