Ucubed is Thomas MacNamara. Useless Unless Unmarked.
and I think you are right about Lewis. From what we've seen, he's not physically ready. The talent is there, I think. He's so much better than Khiry was, but the team was worse then and Khiry's size alone allowed him to occasionally contribute despite his generally poor technical ability and tactical understanding.
Right now, with Maxi, Wallace, Villa and to a slightly lesser extent Harrison, we have the best attacking movement in the league. And that's by a long shot. When you replace any of those guys, it changes so much more than just relative player v. player quality.