KEVIN. Since he is on the outside looking in. When did he come across Aliza? When did he become infactuated with OPHELIA?
SINCE Kevin bugged Ophelia's laptop, does he know some of the family SECRETS?
I believe he first met Aliza (and Ophelia) when he(Kevin) and Aliza became roommates years ago.
This was when Aliza was overweight, and Kevin was one of the few men who was nice to her.
Kevin became infatuated/obsessed with Ophelia soon after when she visited Aliza.
When Aliza lost her weight, Kevin became attracted to her too and started spying on her. But he was still fixated on Ophelia.
As far as family secrets, we know Kevin was aware that Sterling fools around with both Ophelia and Aliza.
And of course he knew about the David/Drew thing.
But you can bet he knows more. And it's likely on Kevin's hard drive that Sterling now possesses.
I wonder what a little digging will uncover?