Too many mistakes to just put the blame on one person.  You can't have two good plays in a row to be squandered by a bad third play whether it's a dropped pass, a fumble or a penalty.  Siemian made his own fair share of bonehead plays.  Not just this game bu the last three games in particular.  A team is not going to go very far in this league scoring 10 to 17 points per game.  (Reminds me of the timmy tebow show). Trevor CAN be an effective QB (probably never a great QB though) with a little help from his teammates.  But until the weakest link in the chain (right tackle) is addressed the offense will continue to suck.