Bruno is on of our key players, and he's an excellent player. But he is suffering from the wider issues at Man Utd, the relatively average ability of some of the players around him, especially in attacking terms. He hit 14 last season.. where was Sancho? Antony? Martial? And Bruno doesn't play as a forward, he's a midfielder. So he is having to carry a workload (like Casimero for example) which is too much, and this gets exposed in the Premiership.
Not sure if he is captain material, I would prefer Shaw given that role, or Rashford even (give them something to grow into..).
We're a fragmented set of players, a trend put in place by egotistical managers. Bruno suffers from this. He needs to be rested, mentally he must be exhausted, and both he and ETH need to understand that we can show faith in other players and get a job done. When Mount is fit, he should rest Bruno. Play Mount. Play Garnacho. Play Pellestri.