He also has, by far, the fewest amount of attempts at 436. This was a run-first offense that led the league in rushing. By that very fact, you should be surprised if his passing yards were high.
On another note, he also had one of the lowest interception rates and I believe he led the league in quarterback rushing.
I understand if you don't like his ability, and there are several things not to like, but don't let that interfere with your logic. You're cherry picking.
It's a valid point that next year's season could be in doubt after dumping Tyrod. Our offense was pretty good. And he is not the reason we didn't go to the playoffs.