Okay, I've been reading this thread and have a couple things to toss out there.
Last week at the end of the show Matt was with his new girlfriend stealing papers from the office. I doubt he went and snagged Kimber and then made it there to steal records.
I haven't thought up to this point that the Carver is Matt, Christian, Sean, Julia, Kimber or Gina. Until the British cop got carved I thought maybe her but, definitely not now. I don't think it's going to be some obscure person from one of the first 2 seasons that's been dealt with already like Bobolit or Sean's old mentor.
I like Quentin as the carver just because of how shady he is but that's such an obvious choice that I'd be surprised, but not shocked, if it turned out to be him.
But after all the reading I did in this thread and all the good points I see being made, there's one person that I've been thinking of for a while that you guys haven't named; Ava.
She's tall, strong and slim. She was married to a plastic surgeon and would probably know all about drugs and possibly even have access to them. She has a beef with both Christian and Sean now because of what they did to her.
Even though Sean did the last operation she needed, she disappeared without much of a trace...but we don't know that she actually left.
She'd have had access to business cards from McNamara/Troy and, again because of her former husband, might know her way around a knife...where she could and couldn't cut to do damage without killing.
Also there have been both male and female victims. Being a tranny would put her in the position of harboring hatred of both sexes.
So, there you have my thoughts on it. Hopefully we'll find out this season though.
And can I just say, the bag scene last night...pure genius. Never in a million years did I expect to see THAT on TV.