but the multiverse is growing in total mass and energy about as fast as any growth fuction that you can conceive, and THAT is what makes the direction of time so strong?
That's not how MWI works. These worlds are not being created. The wavefunction of the universe is being split up between them.
Are there more of these worlds now than there were 15 billion years ago?
If so, you can call it anything you want, but I vote that "created" is a pretty good term for explaining something that exists now that didn't used to.
How many universes "branch off" from a "quantum event", and in how many of them is the cat dead vs alive, and what about non-50/50 scenarios, and please answer so that a physics dummy can maybe kind of understand?
(Is it just 1 with the live cat and 1 with the dead one?)