I saw a press conf with CRG and he said:
1. Ty had the biggest jump in taking in all the info and processing quickly
2. Mack has done a good job of showing command (leadership) for a young player
3. Keelon is "awesome" and "unflappable"
I'm not sure what all of that means, but my take is that Ty is doing the best as far as understanding the offense and what they want to do. Mack also has all the tools to run the offense and he's maturing with age. Keelon has the most talent and the highest ceiling. He's still learning and making mistakes but he's not getting down on himself. It sounds like he has a good attitude about learning.
So...I think if things go as planned, Ty will be QB1, Mack will be QB2, and Keelon will redshirt and be the QB of the future.