I think we largely agree. I think we've both seen limited action from Fekir, as i've only seen the occational match, as well as youtube compilations from before last summer. I view Robben/Ribery as pretty wide winger/forwards occationally dropping in. It might be Fekir might be able to adjust into Robbens position, but i'd expect him to be more comfortable in a #10 position. Same with Lingard, he would be a stretch to fit into a RW/RAM position, because he drifts into the middle too much. Mata, however absurd it seems, is better at keeping width.
I would not want him at United. Not because he is not a good player, because he is, but because with our squad and formation he'd be pushed to the right wing where i think we could find better alternatives(without being able to present anyone particular). If we were to go for a 4-3-3, and if the rumours of Fred are to be believed, something like this should be the starting 11:
------GK------
DL-DC-DC-DR
---Matic------
-Fred--Pogba
Sanchez--Martial
----Lukaku------
Now, i thought Sanchez was being bought for the RW/RAM position in the first place. Guess i and Mou disagree. When he hasn't i wouldn't be shocked to see Martial sold this summer and a true RW being his replacement (don't expect it, but wouldn't be shocked). Provided a box-box CM (Fred?) is bought, i expect a RW to be bought aswell, since this last season has proved we don't have a player ready to cement his position there.
Edit: missed a ] in the quotation marks