Lewandowski has got nothing to do with it. He has been at BM for god knows how long now and is perfectly integrated into their team and style and is the ultimate team player. Cavani is an absolute dynamo and was great for us last season and again, always puts the team above himself. Ronaldo is the antithesis of both of them. Greedy and plays for himself. You can watch him play for United and he only has one thing on his mind. Score a goal. If there is someone in a better position than he is but he might be able to make a yard of space and shoot, he will shoot. Hes undeniably a great player still but I think he has been one of the biggest causes of Oles departure. And yes, I know that without Ronaldos goals Ole would have been gone about a month ago.
That doesn't mean that he hasn't completely unbalanced the team and was a really poor signing.