Absolutely not. There is no way. You're talking 3 rather large athletes. You think one man could kill 3 large men on a boat? Seriously? Even with a weapon, when he went to kill one the other 2 would fight back. Its not even possible.
Furthermore, if he was going to kill those, why would he do it the way he did? Why would you risk your own life to kill others? The doctors said he was close to death, that he couldn't make it much longer there. He was obviously suffering, nearly freezing to death, no one would subject themselves to that on purpose. Its not even possible. It makes no sense. If he wanted to kill them there would be many ways he could have done so without risking his own life and without suffering.
As for his different accounts of his story, keep in mind what this man went through. He nearly froze to death. The doctors said that if he wasnt in extreme physical condition due to him being a trainer, he wouldn't have even made it. Do you have any idea what something like that does to a person mentally? The guy probably has no clue what actually happened. He probably was hallucinating at times, and can't separate reality from hallucinations. I don't even consider it a chance that he murdered them.
