Picton is a scumbag and he deserves life. But finding body parts on his farm only prove he was involved, not that he was the killer. I never heard any evidence that proves Picton actually killed these women. Maybe he did, but maybe he didn't. It doesn't make sense that he actually did this by himself.
I never heard any evidence at all. I wasn't there. I have no idea what the Crown presented. Not a bloody clue. All I know, from reading little snippets of published reports, is that not all of the females there were murdered. Some were, some weren't.
I have no idea if Pickton was the killer. No idea whatsoever. But the Crown obviously presented enough evidence to secure a conviction on six counts of second degree murder. So there was no doubt in the jurys mind that he was the killer.
There was some doubt, obviously, over whether he planned the killings prior to committing them. And you can't convict a man if there's doubt. The jury has to be certain beyond a reasonable doubt. Apparently there was enough doubt that they could only find him guilty of second degree murder.
I suspect what happened is that someone Picton knows killed a prostitute at one of his parties. Picton disposed of the body rather than going to the cops. He probably got paid serious cash and decided disposing bodies was a lucurative business. People into killing prostitutes began using Picton as a disposal service.
I can make ignorant guesses too. My guess is that Pickton took a prostitute out into the barn for a little hanky panky. Things got out of hand when he couldn't get an erection. In a sexual frenzy he gave her a swat across the face and she fell backwards over the pig. The pig then became agitated and tore a chunk out of her thigh. When Pickton saw this, he panicked. He didn't want pig feces to get into the open wound and cause an infection. So he grabbed a syringe which just happened to be close by, and filled it with windshield washer fluid. He then injected this into the prostitute thinking that it would serve as an antithestic.
The body of the prostitute than began to convulse wildly until the protitute tragically died. Pickton didn't know what to do. He couldn't call 911 because he had been using drugs. He was afraid that he would be arrested for drug use, and there would be no one to care for the pigs while he was in jail. So he decided the best course of action was to dismember the body and allow the pig to finish it off.
Of course, this is just speculation.