Personally, I don't think we've given him much of a chance in a cohesive team this season. He clearly operates better in a system with two wingers and a firing-on-all-cylinders Barkley, but Martinez has persisted with some very shapeless formations that would limit the service to any striker. I do think bringing on Kone to close out a game after 60 or 70 minutes is the way to go, as his touch and hold-up play is infinitely better.
So it's up to the £28m striker to adapt his game to the style of play that he's now been involved in for nearly a year and a half. People speak of potential - I don't see that potential in a player who has barely improved despite being asked to play a certain role for a long period of time.
I agree it's not his fault he's being asked to play a certain way, but conversely if he's a world class potential talent then you'd think he'd be making headway if the manager refuses to play to his strengths.
I've never said anything other than Lukaku is potentially a world class off the shoulder finisher, but that's not what we're using him for right now.