Because that's not what they'd be doing. Pep would utilize a player like Leao the same way he's adjusted to having a dominant 9 back in the set up with Haaland. Pep works with what he has and is extremely adept at adjusting. Mahrez and Grealish aren't sprinting toward any endlines any time soon, lol.Don't really see the point of spending 100m on a winger built for the 100m sprint and teaching them to pass it inside like Grealish and Mahrez do.