Lukaku's highest-scoring league season was with Everton in 2016-17, where he scored 25 goals. Everton finished 8th in possession that year, and their overall possession percentage of 52.1 was only .3 off the 52.4 Conte's Inter boasted.
But is this a one-off? Not at all. Lukaku played four seasons at Everton and scored at least 15 goals in three of those seasons. He had one off year in 2014-15, where he only scored ten goals, a year where Everton's possession rate of 54.7 was a significant deviation from the 52.1, 51.9, and 51.9 they posted in the other three seasons. That 54.7 is also awfully close to the 54.8 and 54.5 possession rates Manchester United recorded in the two disappointing seasons Lukaku spent at the club. And if you think that's a fluke, consider the West Brom team a 19-year-old Lukaku led to 8th place in the Premier League. He scored 17 impressive goals for a team that finished 13th in possession at 45.9 per game.
So the evidence says that Lukaku's best seasons have been for teams that utilize a counter-attacking style, while his worst seasons are with possession-heavy teams.
Perhaps, had Lukaku hired a transfer consulting team, they would have told him Tuchel's Chelsea was the worst possible move for a player with his strengths and weaknesses.
Yet, he decided to sign for a Chelsea team that finished last season with a possession rate of 61.4, ranked third in the league. Here we are, and Lukaku is having the worst season of his career with five goals in 23 games for a Chelsea team with a possession rate of 61.8.
And keep in mind, those are two extreme examples drawn from elementary level analysis. A consulting team would have access to the kind of data that further paints the picture of what is a fit for a particular player's strengths and weaknesses. For some players, it's a specific league that fits them best; for some, it's a playing style; and for some, it's a precise formation. Whatever the answer is, it's heartbreaking to see players fail and get ridiculed on social media when it doesn't have to be that way.
The margin between a world-class player and a very good to average one is narrow, far narrower than you imagine. That margin lives in the opportunity they receive and if it matches their strengths and weaknesses.
I hope that the future of the game is one where players better optimize their value by hiring analysts who push them in the right direction when it comes time to make that career-defining move.