Not all the time, but he is capable do it sometimes. He actually did it successfully. Under LVG and Jose as well.
This terrible decision-making and "selfishness" were nowhere to be seen last year. And a year before that. I do mean season, not calendar "years". Now even at the start of this season he was great at connecting with team-mates. Re-watch West Ham game for example and tell me where was this so-called "selfishness" back then? There was not one. Actually the guy still leads with number of assists in PL, tied with Pogba and Micki if i remember correctly. But the more important thing is, these problems he is having now started after he pitted with Martial for starting spot.
Jose terrible man-management should take a lot of blame for that. And given Rash is 20 y/o probably "all the blame". It's perfectly normal for a forward to become "greedy" when you are pressured, esp since as you said yourself to have a chance as a CF he must score.
This has little to do with basics. Jose is a very bitter person, it's evident from everything he does. Now i don't mean it in a bad way exclusively. I mean it in a sense of a severe determination, he is a person who will through anyone, anything under the bus if it'll help him has his way. He is also kind of rigorous. It's a known fact that he likes to cultivate an extremely toxic atmosphere in the club, to cultivate the siege mentality. Sometimes it does help, he did won title with Real and Chelsea that way. But that works for older players obviously.
Rashford perfectly knows these basics you talk about, just look at his game when he debuted. His decision-making, his finishing were top-class and that was at 18. Yet any young player needs guidance and coaching. And this ultra-competitive toxic atmosphere Jose creates is exactly the sort of thing that will make the forward more "selfish".