If you have an Athletic subscription, this article will give you a better idea of why Berhalter wants to try Adams at RB, talking about the way he used the position against Panama: https://theathletic....lter-nick-lima/
To play this system you need a really versatile RB who can read the game well, seamlessly switching from fullback while defending to central midfielder while attacking. Not hard to see why he would want to try Adams out there.
Probably the most influential offensive tactic from this game was the USA’s 3-2-2-3 shape in possession. Harkening back to the WM shape first popularized in the 1920’s, Berhalter used San Jose Earthquakes right back Nick Lima as an inverted fullback, as he tucked in alongside Michael Bradley in possession to form a double pivot.
Lima didn’t just get plaudits from his teammates for his ability to adapt to a new role. Berhalter praised Lima and went into detail on his right back’s responsibilities in his post-match press conference: “It’s not easy to ask your right back to get the ball with his back to goal. It’s not easy to ask him to pivot in midfield to create space for other people, but he did a good job of that.”
The last part of that quote is the key: Lima’s job in his interior role was to create space for others. By shifting Lima centrally, Berhalter added a man in in the middle of the field, which allowed central midfielders Cristian Roldan and Djordje Mihailovic to push higher up the field and act as dual No. 10s. Berhalter’s offensive game plan revolved around getting the advanced midfielders up the field, feeding them the ball, and allowing them to play with the wingers. Berhalter said as much in his halftime interview with ESPN’s Sebastian Salazar, telling him that “Our focus is finding the 10s and then activating our wingers to get behind their backline.”