Sorry. He is an NFL QB. Bad weather is not an excuse, hostile stadium is not an excuse. This is the NFL not pop warner.
It wasn't even that he played poorly for all the reason you mentioned, he never had a chance. He looked scared and unprepared. This from the only QB to actually stay healthy all through mini camp and TC? It was apparent before his second drive started we had no shot with Tuel in there. None
And IMO evaluation is for practice time and mini camp and TC. We are trying to institute a culture change here in Buffalo. Throwing the worst possible option you have out there just to watch him fail shows two things.
1) You don't want to win
2) Screw all the guys playing hard today because its about next season.