I have final proof that Odyssey Vampire is dominant to Odyssey Boo Boo.
I bred a cat sporting Odyssey Vampire with another sporting Odyssey Boo Boo, and took a boy showing Odyssey Vampire. Ivy Norsk bred another cat with one parent Odyssey Vampire the other Odyssey Boo Boo. Again, her girl shows Odyssey Vampire. She sent me that girl and I popped it with my boy and partnered them.
Second breeding they produced a cat with OdyBooBoo ears from under OdyVamp. Ergo, Odyvamp dominates OdyBooBoo and is placed there.
Here's the Pedigree:
Now I am waiting for someone to get back to me about a cat showing Big Vampire and after breeding me some more of those I will start messing with a spare against something suspected to be recessive.