Yup. In hindsight Mourinho could have been better off with Morata. Lukaku isn't the 'new Drogba'. The latter was always full of confidence, and with the ability to make goals from nothing.
Lukaku seems to lack the kind of arrogance or cockiness or that certain boldness that strikers need.
And do not forget other than just scoring goals into weak teams, he also just scored easy goals. Goals that all players can certainly do it easily too. He's a star at clubs like WBA, Everton, but in big teams like Manchester United he's just an ordinary striker, it's natural why Chelsea do not like Lukaku.
I am not your typical soccer/football fan (a you can tell I am based in north amercia where we don't watch as much soccer) although back in the day I did see Lukaku play when he was only 16 and he wasn't yet in the major pros or whatever.