Thread:Dioga beta/@comment-4816710-20150125192346/@comment-5543071-20150125202644

I did say that John would access the Ultimate forms again.

For John being able to turn into the alien he sees, he can do that for aliens that are in the Codon Stream. He is still linked to it, and his transformations are still partially because of this link. After losing the Omnitrix, he transforms into aliens that he knew he had access to. So when he saw Bullfrag, he learned that he had that particular DNA alien available, and therefore allowed him to transform into him. That's why John never turned into Eon, because he didn't know that he had access to his form until he saw someone else use it first.

Since the Ultimate forms aren't in the Codon Stream, he can't turn into them without a device, such as a Stabilizer like Albedo created.