I have too. I think Biles and Lee, healthy, are locks. Grace, with a Cheng, IMO is also a lock.
That 4th AA gymnast could really be one of about 5 or 6 gymnasts. An AAer who is particularly good on bars and beam. I think this rules out Chiles. Apparently Leanne Wong has been working a beam routine with a D of like 7.2 (but obviously, this is in Al Fong’s imagination until it actually gets credit). Wong always had a great bars too (if she could connect everything and not be so inconsistent). Eaker, with an improved bars set, could also fill this role. Obviously, Riley too. McClain also has a shot here. And then there’s Morgan. IMO, the leader for this spot. But if she starts falling on her Toe Ons, and starts trying (incomprehensibly!!) to be throwing DLOs in her third line, she could get overtaken by any of the aforementioned.
As we stand (which is SO early that any opinions at this stage are almost meaningless), my team is Simone, Sunisa and Grace, and then the gymnast with the top two combined UB/BB scores, across both days of Nationals and Trials, of Hurd, McClain, McCusker, Wong, Eaker and Chiles. We know they can all do a DTY and they all have a decent back-up floor. For me, their worth is in the consistency of their UB/BB.