It's balance. He's human. Even Brady at his peak had bad games. But he very rarely had two poor games in a row.
Something holds Josh back from peaking, and I think it's in his head.
It's almost like he doesn't want to risk being hit which is unlike him. Normally he goes for a hit to try and snap him into gear when he's struggling to click.
He did not make him. Josh has looked this shaky WITH Diggs on the field. It's Josh's problem to sort out. Nothing to do with who is around him (though, yes, better WR talent would be nice).
Feels like this happens with Josh. Starts hot, then loses form between late September and November (which costs him pro-bowl/MVP), then builds into the play offs.