We should use prem games to try out stuff now imo. The fact is Martial + Rashford are not working well for some reason. WE need to try two striker formations with them (resting at half time whoever's more tired), and try Martial as the Left wing and Martial as the centre etc.
I think at the moment, Martial is indeed more useful centrally than out wide, and more useful then Rashford. That being said, we can use the celta game to evaluate, because we will actually have a mid field in that game. Rashford's ineffective because we have no mid field to play off his strength (Getting in behind), Whilst Martial's is tricky dribbling, beating men, etc.
Also, I honestly think Owen's kind of right on this one. IMO rashford wasnt intentionally diving, he was trying to not harm himself, I'd rather a player does that then get a serious injury. He was unlucky that Fabianski pulled back his hands, but who knows? It's like half way to calling the foul on Messi or on that Nice player today a dive (Except the challenges were worse of course), just because they went out the way of them and fell. Imo Sane's dive was much worse, same with Alli's (MUCH MUCH worse)