It's extremely evident that all 3 have the license to roam, Ole just doesn't want them to over do it.
But they dont. Rashford is used wide to stretch play with Shaw to create space through the middle for Bruno, Martial is tasked with holding it up through the middle for the attackers to play off of while Greenwood drifts inside to support Martial and create space for AWB to run into.
Its easy to spot. Close your eyes and picture AWB going forward. He usually has the wing to himself as he jogs into space or is trying to actually cross a ball.
Picture Shaw and he's laying the ball off to Rashford with 1-2s as he is played up to the byline.
Now picture Mason getting into a crossing position. Thats a lot harder to visualise.
Its why Bruno is always trying the killer ball, sonetimes blindly. All because he knows where our attackers should be.
Anyway, the point was they dont have a license to roam. Which they dont.