The Rusev-Lana arrangement is stupid. Nothing to do with Lana, but Rusev does not need a female manager. It gives the impression that underneath his beastly exterior, he does have a warm heart lurking. Fuck that, he should be a monster with no heart.
I think there's a perfect fit for someone who should be Rusev's manager, and he's already on the main roster.
He could bring him in to the roster to stop him being treated like a rag doll by guys like Kane and Ryback for example.