I think our fitness coaches know a lot more than us, and the fact that the two aren't starting must mean they're not fit enough to start.
As for Bruno being on the right, it's not ideal, but I can understand it. Ten Hag gained success from using three out of the four attacking players last season, with Hojlund starting instead of Martial.
Amrabat and McTominay are in there to the dirty work, as Fred and Casemiro did last season. We're not going to outplay City, so we need to try and frustrate them.
Not too sure why Mount isn't starting, but the fact that we've won our last three games without Mount probably forced ten Hag's hand. That, and its clear that ten Hag made a mistake when brining in Mason Mount, who most people said we didn't need. What we did need is a top class box to box midfielder, who would have been starting next to Amrabat today.