Aye, pretty much agree with this.
I said before we signed him that of all our former strikers Lukaku was most similar to Chicharito, the difference in their physique being largely misleading in terms of the way it effects their play. If you look at Lukaku's goals for Everton the vast majority of them were the type of goals Hernandez scores. Lukaku's height, pace, power and youth gave him added advantages over Hernandez but didn't make him a different type of player (imo).
Which is partly why I thought Lukaku's signing made sense. After all, a few months before we signed Lukaku Mourinho had specifically name-checked Hernandez as the type of player we didn't have: "The way we play in their box, I think Chicharito would have 20 goals, easy. Even coming from the bench for the last ten/twenty minutes, we'll have 20 goals. He's a guy that, naturally, the ball comes, rebound here, rebound there, boom, goal. The goalkeeper saves he goes there, tap-in goal. The cross is coming, he anticipates the first post, header, goal."
I figured that we were signing Lukaku to do what he was good at and be that player. Instead we spent all of last season trying to make him be something entirely different.