Rashford has been having issues at United for a couple years now, his best buddy was removed, he's been called out by the fans and media, new coach has dropped him, called out by name, and asked for him to be moved on. He's got a point to prove to Amorim, United, media/pundits, fans, England manager, the greater football world. He's gone to a club he didn't want because none of the clubs he wanted came calling. He has to prove himself to get that move or reestablish his united career. He wants to go to get back in the England squad and make the American WC. Essentially, this is Rashford at absolute peak motivation, he's got it all to play for, yesterday was game one, all eye's on him, and "he was lively".
That's it, everything to play for and nothing looked different. I saw comments in here about him scoring 15 goals in the remainder of the season, at this point I will be surprised if he scores 15 more goals in top flight football, if he couldn't get motivated yesterday to actually do something productive, now I am convinced more than ever that he doesn't possess the skills or mentality to prove anyone wrong.