(((*thinks it over*
Well, there really are no rules to creating a Nobody....The game was very lenient with it, saying that anything that lost it's heart would become a Heartless, and perhaps create a Nobody, like a human one.....But, that doesn't mean that it would create two Nobodies.
You don't even understand what synthesized means, do you? By definition, synthesizing something is creating something from different materials collected together. A synthesized Nobody means that it wouldn't require losing a heart to create it.
But, that's not how you said Dy was created. You said that Ty was kidnapped, and the Organization forcefully removed his heart, which would reulst in Dy being a regular, ordinary Nobody, not a synthesized one, as you call him.
This also defeats the purpose of your new "mysterious figure" idea, since Ty has already lost his heart in the creation of Dy, and he would have to get and lose his heart again, which, of the latter, he has not.
Hey, Chey, let's have eleventy billionc haracters and make different plots with them just to confuse everybody!
I think I'm about to quit. I'm tired of Rapture making a new character everytime something doesn't go his way.
It seems like you need to read Dave's OOC about "Thinking something out before you post it", as well, Rapture....)))