Splinter's origin story.

[Savanti Romero]

The old cartoon's orgin never made sense to me. I like the pet version much better. It's more believable. The ooze contains somthing to genetically alter a creature to take a sort of human shape, but at the same time keep many characteristics from the original specimen.
If the ooze made a human change into a creature he had come in contact with, to me it seems a much more controlled environment would be needed. If Yoshi was touching a rat and then touched a turtle he would keep the rats form? So thats implying the ooze KNOWS what the first creature was the person came in to contact with and doesn't allow another creature to mix in, even if that other creature came shortly after?
To me the ooze isn't an entity which can decide on things like that. I don't know, it just makes more sense to me that he was a rat first especially because the turtles didn't mix with a human.