It's not that mate, he is just a not very good footballer who had a run of decent performances with one stellar game from him in that 4-5 game run, 31yo who at his best was just decent, with a major injury losing him near enough two years of football in his late 20's-early 30's and played out of position - what can we honestly expect from him?
Like with Naismith, can't fault his commitment and has the rare moment in a game that he looks good, but his level is below most of the other players around him by a decent way
....I'm can only think he plays because the manager feels he brings the best out of Lukaku.