At 26 (by the time we sign him) he's already peaked, thus he must perform right away. He needs to adapt to the team and the league instantly, for the price tag to be justified. If we signed Iker Muniain, for.. let's say £26m, and he failed to adapt to the league and had a mixed first season. He's still a 19/20 year old with raw talent, and unlike Lukaku, Muniain has proven his worth in the best league in the world. We could sign both though, with Muniain operating on the left side of a forward three.