It's not about that though is it?
There's no strikers on the tour from the senior squad. How about Martial shows a bit of desire and sees his new born then comes back to help the lads on tour out and knuckle down for the new season?
Why would he do that when he is reporting to a manager who has publicly forced him to stay, froze him out of the first team, publicly criticized him on the same tour?
Martial has made it clear that he wants out. A bit unprofessional but even Jose has hardly been professional in dealing with him.
Martial would think that he is better off in a club where the manager is not a guy who keeps criticizing the players in public and instead helps a player grow and realize his talent.