I read a Jose quote about playing Martial centrally in coming seasons if he does stay. I think it is his better position because he just can't cut it as a pure winger. One of his best games this season I can recall was when he and Lukaku played together away at CSKA.
So if the manager is feeling this it could be a bit of reassurance for the player.
Sane, Sterling, Insigne and Salah are fantastic players in their own right, even before moving to their current teams. It's very presumptuous to assume Martial would just automatically improve like them. He didn't really shine in the last European tournament despite having all the support and favorable tactics. Actually he was benched most of the time by Payet, despite his excellent debut season with us.
Lastly, the attacking versus defensive setups is a matter of opinion. Mine is that a top player should adapt to his current managers tactics. And it's not as if Jose's system prevents attacking. Tonight we saw several counter attacks and later on close range intricate passing buildup. Even though it was a newly promoted side, Martial didn't shine. As I said before , part of the issues is his supporting cast but what more conducive setup does he need? Knockhart and Gross had terrific games against the leagues second best defense Tonite (us). And that was even after they sat back . So for me i just don't buy it. It's just an excuse
Edit: link to CSKA highlights
How is he going to play him centrally when we all know he barely ever plays with two strikers and Jose's has already bought his own 75 million quid striker?
We hardly have a consistent attacker in the team, even someone with a reputation as big as Sanchez is struggling. The closest you get to consistency in those areas is Lukaku and he's had some stinkers. The truth is despite Martial's superlative talents he needs to develop a lot. He actually needs to learn the game and fully understand his role in the team through set patterns, he isn't going to get that here during Jose's reign.
Give it time, you'll understand one of these days when we get a proper attacking manager. Those players went up a level or two when they starting getting managed by top class attacking managers compared to where they previously were. Insigne for example was a failing talent under Benitez(A poor mans Jose) but now he's arguably the best player at the club. Salah went from a why would Pool sign him player to a should he win a ballon d'or player. Sane was a promising talent, now he's one of the best wide men in the league. Sterling's production, without really improving his fundamental's as they are still poor has improved his production at a ridiculous pace.
Logic dictates that if you play in teams that focus on attack and you're an attacker, you'll do better. The same with defenders who player for ultra defensive manages, they all suddenly turn competent for simple reasons. Attacking football has gone up a level this past decade and it's something Jose just doesn't have. Klopp, Pep, Sarri and Jardim are the best managers for developing attacking talent and it's easy to see why.
What's the point of mentioning how those two Brighton players did? if you watch them week in week out you'd know they are highly inconsistent. What's the point of mentioning the Euro's? Martial played 69 mins in the tournament and lest you forgot Payed had come from a season where he was one of the best players in the prem.