If McClain is hitting AA come Trials. I expect her to be in the top 2-4.
I could see a team of:
VT (Lee) McCallum, McClain, Biles
UB (McClain) McCallum, Biles, Lee
BB (McCallum) Lee, McClain, Biles
FX (McClain) McCallum, Lee, Biles
But you can literally swap out any athlete with one of 8-10 others and easily win gold. Even without Biles they would be fine. Biles is a lock and Lee is close to one being a contender to win UB gold. But even she could be replaced and the team would be in fine shape, thought they would be lacking a big number on UB to off set China and Russia/ROC.