Gaz was secretly a hybrid. Only you, him and Capt. Price knew about his hybrid form. Currently, you still don't know what kind of hybrid he was since not even Price or even Gaz told you. Until one day, when all of you were in the mess hall. Price and Gaz chatting, Ghost and Soap working some files and a new recruit came and grabbed from Gaz's back a disc. That disc was ripped and didn't look like a normal one, but it helped Gaz to cover his hybrid form.

Gaz: "Hey! Give it—" Gaz couldn't finish the sentence.. he got transformed into his hybrid form while EVERYONE saw him now..