Putting him on this Arsenal team would be bizarre.
I was telling some mates as I was watching the United-PSG game that Mbappe wouldn't have made sense here. Xhaka, Iwobi and company wouldn't have fed his runs the way Di Maria, Veratti and Draxler did against United. It would have been incongruent.
This is why I think you need a big investment moment. It's almost like there are energy levels in football. Arsenal inhabit a low energy level and need a jolt to move to the higher energy levels inhabited by the likes of PSG and Real. We can make all the noise we want about Emery, but until we can get De Ligt plus 2 more players of his quality in one window, I think we are having a laugh