I think the answer to your second question depends on who coaches USA as apparently they just love playing people in weird position like Adams at RB. To me he should be in midfield now with McKennie but I don’t want the US side to know how they play.
Towards the end of the season, before he injury, the team went on a decent unbeaten stretch with Adams starting and he looked first choice. Can’t tell for sure under the new regime as he’s still out with a groin strain but mooted to potentially be ready for the Villa game as he’s currently back individually training.
He was brilliant though when he played; much more useful on the ball than expected. Big season for the lad. If Nagelsmann goes with two midfielders you could say for experience Demme & Kampl will start but I actually prefer Adams & Haidara/Nkunku.