Was Applewhite standing on a stool in that picture? Serious question.
Ash was on his way to being a damn fine QB.
I agree with others that think adding other Power 5 true freshmen QBRs, and their progression throughout their careers, would help paint a more complete picture.
Buechele was limited by his injuries, his OC's playcalling, his coaching staff, his defense, his being a freshman, Burt's regression & his own talent limitations, and was still pretty damn good for a true freshman on a bad team.
In a perfect world, Heard has a strong spring as a QB and is the solid backup, Buechele makes great progress projecting to be an all conference type starter allowing Sam to redshirt. This gains separation between Sam and Buechele, get's Sam healthy and more prepared for the college game. However, if Sam shows to simply be the best QB, then start him immediately. Recent history has shown that redshirting, when possible, is still the best route for great QBs. VY, Colt, Manziel, Boykin, Mariota, Winston, Luck, etc., etc. It isn't necessary to redshirt, but preferable, especially if you have a guy at QB who is solid and could be great.