Back to the prospect....
Effort to finish blocks, find more work. As well as, awareness.
Pretty good self-scouting. Also pretty good feet, but he will lunge and lose balance. Brent Key, who he mentions first, will clean a lot up, but too often an experienced line transfer will spend a year acclimating... learning the system, learning new teammates, learning better techniques, and more. (This is why the idea of a plug and play offensive lineman transfer is not the given a few idiots on here assume and demand.) Whether it is golf or ping-pong or chess or football or most anything, you plateau for a while when you leave your comfort zone and make minor but fundamental changes to improve. You have to build muscle memory and build mental recognition speed all over again. So that plateau often means you play worse than you did before.
I think Kirby recognized he was as good as he was going to get where he was, with the coaches, competition, and teammates he had. This next year for him will really be a lot like the rookie NFL season for a lot of small school kids, except the coaches have more time available to develop players. He will break down and build back up. He may take to it like a fish in a new pool of water. He may struggle.
Think Parker Braun, but into GT instead of away from GT.
Kirby looks to me like a natural guard with the feet to help you in a pinch at either tackle. He might be able to stay at right tackle and play on our team; that would be up to him and his ability to compete. Heck, he might stay at LT for us if competes better than the other guys. But I see a 320 pound guy in the pros whose best position is guard. (This is not a knock, as I do not see guard as the place you play if you cannot hack it at tackle. It is where you play if you have certain skills, which I think Kirby has.) I do see pro guard potential with movement, meanness and tight quarter battling ability. I see a guy with the attitude to be a pro center, if he can snap, and most guys can learn to snap. He does have good awareness, on the little clips I saw, and that can save your quarterback's life at guard.