#2 Allows Lana to replace Lio Rush as Lashley's manager
I've had the honor of interviewing Bobby Lashley in the past, and I've personally always felt like he was a well-spoken and articulate man. However, he obviously does not thrive in an environment where he has to deliver scripted promos, which is why Lio Rush was such a natural fit with him. However, Lio Rush is the WWE NXT Cruiserweight Champion at the moment and to have him paired with Lashley would just confuse fans.
This is why the whole idea of Lana having an affair with Bobby Lashley solves a very basic problem that WWE was facing, of someone speaking for Lashley! All said and done, CJ Perry is an established actress and she can control the crowd with her microphone skills. Also, she has no issue playing the heel and appearing embarrassed when the segment does not go her way!
So, now Lio Rush is doing his own thing and Lana's doing what she's really good at. We're pretty certain by now that she's not exactly Daniel Bryan in the ring, judging from her previous stint.