Re: What's the point?
Or he stole the money himself, and was murdered for it, either by someone who had a scheme for getting the money from him, or simply for revenge. Or the money was stolen by a group of collaborators including Cotten, and they decided to reduce the number of beneficiaries. Or he was killed for some reason unrelated to the cryptocoin heist, because people who are willing to violate the trust of others often don't confine themselves to a single infraction.
And so on. Really there are quite a few possible permutations.