I mean i dunno and all of the things i said are highly speculative anyway but:I can agree with most of this except one thing, Auxo can't be the creator of these universes because that would implied that she can create CJ shards to experiment with. Either that or she had a bunch, created a universe, placed a shard, failed, and repeated, at which case she wouldn't need more than one shard to retry for infinity and she wouldn't need to go to different universe nor go to CJ's, she could just keep trying reusing one shard. The only way that her needing different fragments make sense is if she went to universes already created were a shard of CJ landed so she could try again, and of course dooming that universe in the process and moving to the next.
When CJ split himself into (however many shards) we dont know what happened to these, maybe Auxo grabbed them (lol) and planted them. And of course she would plant them all to increase the chances to get the jackpot. Time seemed to be still important.
As more tries she has as higher the chance to finally get everything right and maybe she took these shards back after he died (when the other ones didnt destoryed/captured the shard).
Like she plants 1 million shards and waits for the univereses to grow, wait until cj gets born at some point and if he dies reaps the universe again. Thats how i kinda imagined it, a neverending circle of universes with cj shards being created.