My concern with the US is the back line and goalkeeper. I have watched almost all of the team’s games over the past two years. We appear to be very vulnerable at the back. Lots of mental mistakes and slow. The rock is Sauerbrunn. If O’Hara is healthy and Dunn plays a disciplined game the defense can hold. Dahlkemper is a question. I still like Krieger for her experience and intelligence.
I would add to your list of three depth. Injuries and conditioning will play a role as the competition heats up. The US could play France in the quarters, which means one will definitely not win a medal.
The back line has been a question mark for some time. Part of the problem is that Kelley O'Hara missed so much time with injuries. Tierna Davidson also seemed to have nailed down a starting spot, but then she went down with an ACL tear in a college game. She's now back, but appears to be a reserve, at least for now. (I think she's part of the future whatever happens in this World Cup.) Ellis kept experimenting, and as late as January of this year she was still shuffling players and trying players in new positions.
On my optimistic days, I think the back line will be fine now that all the experimentation is over and they've settled on everyone's role. If it's looked shaky over the last two years, it's partly because it's been rare to have the same players out there from one game to the next. I hope that doesn't come back to burn us now.