I worry that centrally he will be easier to put one or two players on to mark him tightly but then again, he doesn't seem to notice or mind people marking him

And when was the last time we had a player who occupied more than one opposition midfielders?
Also, shit like a nutmeg to Gylfi on the 6-yard box doesn't look as pretty as 50 yards from flank to flank but it's far more fooking dangerous.