I think the only reason we saw him centrally is because Mahrez was playing RW all pre season and Pep prioritized letting his 1st team getting minutes in their preferred position.Palmers best position is clearly on the right wing. For me in central areas he’s not good enough and doesn’t effect the game. But play him on the right and he’ll do just as good of a job as Mahrez
I see Palmer in the Mahrez mold as you said, and I suspect Pep will continue with Inverted wingers from now on, hence the Grealish signing.