Not going to lie - I thought that number was the amount of people allowed inside the lock - as it was six upon arrival... I didn't realise meant the lift outside . That throws a huge spanner in the works there if that is the case.

I'm just gutted it's leaving Netflix - as I don't have a MAX subscription. So I am hopefully that E4 will continue to be the place where the UK is able to get their Rick and Morty fix

If I were to hazard a guess. the cloud machine was iso-something it had to be controlled by Kazran and no one else. However, later in the episode he can no longer control it. While past and future versions exist - they both biologically change. Which is why although the reapers come for Rose after she holds herself as a baby. There is also no boom then

The two items in question HAVE to have the same atoms - albeit from different points in time. Humans grow and change, whereas the star certificate can decay, the atoms themselves haven't changed.

That's my thought on the process anyway.