Everyone is humming over the big man's relocation to Napoli. With Roma, he's off a 21-goal season, hence the scoring touch is obviously still there. Lukaku is no longer the fastest man on the field though. For him at this point in his career, the Premier League tempo might have been perhaps too fast. Having said that, Napoli requires a clinical finisher since he is still one.
The shock defeat against Hellas Verona was certainly surprising. At that time Lukaku was not in the Napoli squad. Then, Napoli won 3-0 over Bologna which was good news for Lukaku even though Lukaku was not in the Napoli squad either.
Making his debut against Parma, he made the whole stadium cheer because their hopes of not dropping points were realized and he scored on his debut.
It is very likely that Lukaku will be the one who decides Napoli in every game. It is not impossible considering he is a player who has proven his quality in Serie A while he was not on the operating table.