On that twitter post i put about Miller, watch the play at 1:04. He blocks, then moves to help Jones w/his block, pushes the guy to the ground, goes back to the C to finish that block. Jones stops trying the defender gets up off the ground and almost sacks Williams.
I didn't consider the back injury possibly affecting his current play. He does need to be more consistent. And I notice he sometimes doesn't finish blocks and his guy negatively affects the play. He's still very young, only 5 games from his rookie season. I hope we see him become more consistent because he has a lot of talent.