Big Willie I think Trossard's almost certainly given different instructions based on everything I've heard about how Arteta coaches.
The approach is pretty detailed, there are player quotes indicating it goes down to specific proportions of the time specific wingers should cut in versus go on the outside, how often to cut the ball back versus crossing behind the lines, and all that.
There are also matching "automatisms" about the runs players like Ødegaard and Saka are supposed to make when Martinelli's on the ball and has made one of these decisions … one of Øde or Rice is supposed to head to the top of the penalty area for the cutback for example. Pretty obvious stuff I guess.
But @Clrnc is being fair when he says there's a "pictures" issue with Martinelli's game on top of the instructions. There are runs Trossard that is able to see and make (like his run for the goal versus Villa) that are moves Martinelli probably isn't barred from making, but just doesn't have the vision to actually make for now.
Gabi is going to need to step up in one area or another: either improve his decision-making (and vision), or his execution of passes and shots, or his one-on-one guile. If he doesn't then he'll be dropped again, and eventually he'll be upgraded. Seems pretty obvious he'll have a lot of better days than the one we just saw however.