He managed to get Hazard playing at another level by speaking about him in the media and expecting more from him at the start of his second stint at Chelski. If Martial can't handle a little competition he doesn't deserve to be at a club of this stature in the first place. Simply having talent isn't enough, Nani and Quaresma etc. amongst others is a clear indication of that. The best players are hungry and will fight to prove a point. Hell, even MickyT who everyone says is a right fanny took being frozen out and the criticism on the chin and just put in a top-drawer performance trying to force his way into the team.
I'm a big fan of Martial, in fact, he's my favourite player at the club (along with Ander) and the sky is the limit for the kid, honestly has the talent to be one of the best in the world in his position, but he needs to perform. It's a shame that he set the bar so high for himself last season because he was unplayable at times, but that just shows everyone what he is capable of, it's on him to aim to try and replicate and even improve on those performances.
Apart from De Gea, Bailly and Pogba, no other players in our team should be guaranteed a first team place, they need to fight for their chances and then take the opportunity when it comes. As good as Martial is, and can be, he doesn't warrant being given special treatment, he is a player who still has everything to prove.