I assume you watched a lot of mid table French football in the early noughties to know that Drogba was such a star when playing for Guingamp, or not.
The notion that a footballer can't improve at Lukaku's age is absolutely ridiculous. Vardy is another example who at Lukaku's age was playing for Fleetwood in the conference and has now won a premier league title and a golden boot (?). But I suppose you were watching him loads for Halifax Town and he was just a "natural footballer" and never has improved since he was plying his trade against giants such as Eastleigh and Dover...
It's not ridiculous at all cos it doesn't happen. Look at drogbas scouting details going back.... skilful, good touch, fast. Was raw in his movement decisions and strangely enough was physically a bit lacking strength wise.
Vardy.... according to Ian Wright who seen him at fleetwood under Mellon said he was rapid with a great first touch.
Show me a footballer who has a touch as bad as lukakus has been for the past 6 or 7 years who suddenly gets it right? It doesn't happen. Marginal improvements at best.