Yeah no, he was left out deliberately. There's too much hidden about Urianger, it's all part of his character to not be there.
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Every time I hear someone mention Bahamut and Odin all I see in my mind is Bahamut standing around acting all badass and suddenly Odin appears and Bahamut is all "Nonononononononono".
he was an annoying creep anyway. could not stand him one bit.
I think he knew what was coming as did cid and took his leave somewhere, perhaps the same place lou sent us.