Would you accept a gut feeling? Rene seems like the only other person who has any sort of trust in Bill and, by extension, the other vampires. Maybe I'm just incredibly cynical, but this seems like a story where the seemingly most tolerant character is one of the least tolerant after all is said and done. I believe the producers imagine him being a good curveball.
I am an INTJ. Try again.
SPOILER
Actually, I think you looked it up. There's absolutely no solid evidence on the show that would point to Rene.