You said it but didn't explain how would they've done it differently to account for deaths on Satoshi's team. Why haven't those million bitcoin's moved?
I don't believe in this scenario. Again, someone who can build such a protocol is smart enough to know that people can die, even that they will die eventually, the question is only when. If they were a team of say four, they would never share the keys in a way that is a 4 out of 4 set up to get access to the coins. They would have done it differently such that a possible death of a member is accounted for.