I see what you're getting at and won't totally dismiss it. But even Josh Allan faced teams like Nebraska, Oregon and Iowa. He also faced Boise St. who were ranked #13 at the time.
I think it seems logical for NFL scouts to more heavily weigh how a college QB plays against his better competition than they would his weaker opponents. Less pressure and looser coverage makes it much harder to see what a QB would do in more stressful situations when facing far more adversity.
When down two scores in the 4th quarter. I want to believe my guy can win this game.
That's what we're both looking for. I think where we differ is I don't think I'm going to find out the answer to that question without heavily basing it on if he can do that against his best competition.
When you're playing a nobody team, you aren't facing much pressure. The coverage isn't as good on your WR's. It's much easier to get in your comfort zone and not be forced out if it.
For me the only way you can tell how a QB will perform under duress is when he is no longer in his comfort zone.