Ole's comments to Norwegian TV are spot on. Rashford has to shoot from distance and take players on simply because no one in the team has been able to pick out his runs in behind. Whether that was coaching from Jose or just a lack of finding him, Rashford suffered from it. He makes so many good runs diagonally that don't get rewarded. If Ole can figure out how to get the team to find Rashford in behind more, I think everyone will see how good a striker he is. That's not to say he can't improve on his finishing or his composure because he does.
For me, Martial is a LW and Rashford is a CF, at least in this team. When Ole sorts out the RW position, probably with Alexis, then Utd will start scoring the goals they should have been scoring all along.