Scott Frost as a college quarterback would never sniff the field for meaningful snaps in Scott Frost the coach's offense.
Now the comparison between Tommy Armstrong and Tommie Frazier is interesting. They've got a similar physical skillset - similarly fast and agile, similar velocity on throws, etc., and their career numbers and their best season numbers aren't that far off from each other.
So there's a good, legitimate question of whether or not Armstrong could have been considered one of the best college quarterbacks of all time if he was leading teams where A) he didn't have to throw the ball 25-30 times a game, B) his receivers were routinely wide open due to the nature of the offense, C) he had all-americans on the offensive line and in the backfield, and D) he had a top 10 defense keeping him safe and keeping his teams winning.
It's certainly not implausible.