Ironically I think if the club gave Martial the attention and priority they gave Rashford, we'd be looking at a different player.
LVG, Jose and Ole all chose Rashford over Martial because Rashford being the Mancunian academy grad despite being less talented than Martial. To Rashfords credit though, he's scored far more game winning goals than Martial (I think I saw a tweet claiming Rashford has scored the most last minute game winners in United's history, which is incredible considering his age)
And Martial just comes off as being lazy, as well as being French, and doesn't have the public persona that Rashford has. It's unfortunate really