Then if you can't do a better job, sure, go ahead and explain how you'd make it plausible and not totally out of nowhere for the Zuma and daimons to leave. You can't just say they never existed. They are there as part of Dwilight. Now deal with that, and move forward with how you think they should have worked.
A tough spot? Rather, the burden is on you to say how it should have been. I am content to stay with what already exists.
And as some reveal that is a bit anti-climactic, I once asked Tom what would happen if a human became ruler of the Zuma Coalition, and he told me he'd change it to a human realm. Not sure how that would even make a difference, since the one human there doesn't care to do that (No duh, I'd rather sit around and watch daimons fly around than be ruler of pretty much the first realm to get revenge-stomped once the daimons go bye-bye), but I guess there's no harm in telling you that now.