Lukaku was a terrible presence for the team from day one. He clashed with players on the team the moment he got here. He was constant distraction. I am not really high on Auba, but I would use a better comparison than Lukaku, that was an absolute disaster.
Edit to add. Auba is by this time of his career a tap in merchant, but he does press rather hard and flies around the field. His offensive output is definitely declining.