The same Lukaku who scored 15 goals for us last season? And 27 goals the season before that.
You do know that he's 27 years old, at his prime, while Rashford is 22, Greenwood is 18 and Martial is 24?
I don't want to say anything about the current state of Serie A. Let's just say it suits his abilities perfectly. Conte's system works for him, God bless.
Let's compare apples to apples. Rashford and Martial are among the top 10 scorers in EPL last season with 17 goals, despite both of them missing a huge chunk of the league through injuries. Lukaku's best for us was in his first season, he scored 16.