You are not alone in failing to grasp RLC. I think we all are a bit infatuated with his size and some of his skillset, but he never seems to but it all together. He doesn't play to his physicals strengths, I do believe is my main concern. He should be a battering ram, not a wannabee Pedro, lol.
He is one of the truly puzzling players in the EPL. We have 3 more in that league as well, Morata, Emerson and Barkley. I cannot wrap my head around any of the 4 fully.