There are arguments his actual best position is the LWF position and he's also great at just switching wings mid-game and trying his luck on the other side of the pitch.
I really wouldn't be surprised if he ends up in the middle by his latish 20's, personally. He has the skilset, the intelligence and awareness, but for now, it'll be great for us that he can pick up any position across that final third behind the striker and be effective from it. Bruno and Pogba roam a lot as does Martial, so there could be some multi-positional exchanges going on the likes of which we've not seen since the times of Rooney, Ronaldo and Tevez.
It's all very exciting. I'll wholeheartedly admit I've been on the Sancho muppet train in this thread for years now
and haven't anticipated a signing as much since the times of Vidal and Thiago... let's hope this one has a better outcome!