I think Itachi activated Izanami and allowed himself to be killed. Since Edos cannot be killed, he has decided the reality of the edo nature and thus they are now killable. So my theory is with this move, Itachi puts an end to edo tensei. Sasuke will be alone and frustrated in the beginning of next chapter but then will realize what Itachi did, explain it to the readers (Or Kabuto if you want to put it that way), and it's gonna be a fight with Sasuke vs Kabuto
Theory on Creation of all things:
Nagi and Nami are symbiotic powers used for creation. You change imagination into reality through Nagi and you make it permanent with Nami. Then, to make the complete use of it, you need senju dna. That's my take on it. Danzo/Tobi for example alters their existence but it can only work for a time and the state will be reverted. If say the sage divides jyuubi's chakra into 9 tails and doesn't use izanami, he would go back to jyuubi after a while. That's my guess
Edit: Updated a bit
Theory on Creation of all things:
Nagi and Nami are symbiotic powers used for creation. You change imagination into reality through Nagi and you make it permanent with Nami. Then, to make the complete use of it, you need senju dna. That's my take on it. Danzo/Tobi for example alters their existence but it can only work for a time and the state will be reverted. If say the sage divides jyuubi's chakra into 9 tails and doesn't use izanami, he would go back to jyuubi after a while. That's my guess
Edit: Updated a bit
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