He would be of use just thanks to his presence alone, pinning one or two CBs on him during crosses. idk what Flick was thinking, Ferran in no space is almost useless. Ferran + Lewy would have been good though.
Someone like Lewa is not a guy whose efforts are to be aborted before the job is done. It is different when he is invisible, disengaged from the team effort, and replaced because of it, but he was everywhere in the attacking work, posing a formidable threat.
Who cares how many strikes of an ax it takes for a lumberjack to bring a tree down, as long as the tree goes down, it is all that matters.