The problem isn't arm "talent." It's touch, accuracy, decision-making, and ball security. He's clearly the third best option at this point.
Arm talent consists of all those traits. Otherwise "arm strength" would have been used. Every quarterback hits and misses throws. Learning to utilize the tools they have takes time. I've seen enough of Mikroe and Simpson to know I'm taking Milroe right now in an SEC game.
Also curious how much you've actually watch Buchner and Simpson. Buchner has the tools, but the ACC and Notre Dame ain't tge SEC, and his injury concerns are valid. Ty Simpson, one A-Day game?