He would score 20+ goals in the PL too if he still was here.
How can you be sure? He's managed it once in his whole career and only managed 16 in his best season for us.
In fact if we disregard his last season here (where he was abysmal and was benched) and only look at his first season where he was the undisputed #9 and before he took such flak - you can see his PL numbers aren't great when compared to our forward line.
17/18 Season
Lukaku = 179 minutes per goal (1 goal in 10 games against the top 6)
This Season
Rashford = 134 minutes per goal (6 goals in 6 games against the top 6)
Martial = 160 minutes per goal (2 goals in 4 games against the top 6)
Greenwood = 104 minutes per goal (0 goals in 4 games against the top 6*) *only 132 minutes total
So even with Pogba, in a team that finished 2nd in the league and as first choice throughout the season without injury, Lukaku didn't manage to outperform our forwards so far this season in his best year here. This is before we even talk about attributes such as first touch, link-up play, work rate and fitness. Anyone saying he would improve our frontline above Martial and Rashford is an idiot.