Well, would Thea Lundgren know about Bear? I made sure to let sister tell the tale (having 3 sisters, I know sisters get REALLY annoyed when they get interrupted), so that part was verified as correct.
I still suspect Marcus to be Thea. Why does he have those radioactives in his lab? And what is that black case on the shelve above that? And why are those food dyes so important, when all he'd need is to properly label the pillboxes? And how did he even run out of his previous stack of food dyes? You'd need to be making pills in industrial quantities to ever run out of that stuff.
Not to mention, he's shooting blanks, does "he" even have a real penis, or is it a prosthetic appendage?