I'll admit I've been shying clear of forums for a while so this is the first time I've heard a theory like this one. It makes sense though and I'm eager to see what the heck is going on with Isshin either way. Stupid Golden Week and making us wait for more ;p
I can't consider them Death Gods because it reminds me of Death Note. But I like Shinigami in the Japanese versions and Soul Reaper for the English. Either of those works for me.
I was disappointed at first that they were planning on starting it over at some odd episode in the middle of the arrancar arc and then when I watched it a couple weeks ago it was starting over from episode one. Seems kinda dumb if they're just gonna stop it for the new episodes in a couple months.