Like a certain Didier Drogba. Lukaku has the physical presence that Chelsea lack up top – and even if Mourinho thinks that he can get it from third choice Demba Ba, the quality Lukaku provides is far higher.
When passing does not work, sometimes you have to hoof the ball up field and we know Mourinho is not afraid to do that – with Lukaku he has the perfect forward to do that.
Lukaku can also help defend from set pieces and be a massive threat in the opposition box in a dead ball situation.