I think there is always the argument to drop down a level (ala Sancho to Dortmund) in order to get more game time. Dortmund have said publically he will be guarenteed game time straight away. The very best talents will never be ready for the PL at 18 or so in a team that is competing for the PL. I know people will point me towards Rashford but he's certainly not at a level yet where he can bring is to challenging for the PL, that is Romelu and Ibra. Rashford has undoubtedly been very, very lucky in getting the chances he has as early as he has and IMO and he is now being artificially fitted around the team to keep him happy and give him game time. I would argue unfairly with regards to Martial and his development as Mou is clearly showing a bias towards Rashford.
Gomes has every right to be concerned about his pathway here, given that we have Mkhitaryan, Mata, Pogba etc in the squad.