alot of those kids don't get recruited as QBs. they may get told by the staff that they can give it a shot if they want, but most of them settle into the position that they were actually recruited for.
I'm not sure why you're stuck on this when many people have already proven otherwise.
Betts and Wheeler are pretty good athletes. Betts could be a safety or a linebacker. Wheeler could be a wide reciever or a safety.
When you watch their video, they have nice arms and the physical tools we want in a QB. They're both development projects that you have the luxury of bringing in after you sign the best QB recruit you've signed in a decade. If they don't work out, they can both easily move positions, or if they don't like moving, they'll transfer. However, the fact that Wheeler is a legacy makes that less likely.
No one is going to confuse these kids with Skylar Thompson. But they're both D1/P5 athletes that we can use on our roster. TCU has continually brought in HS QB's and RB's and converted them to something else, usually defense.