Clavell is the human form of the third legendary.

>b-but Clive
Clive (which is not Clavell's first rodeo on the cosplay train, the first one was Heath) is just a red herring. What other human character comes in a box exclusive non shiny and a shiny colouration? Think about it.

He has also seen legions of dumbasses throw themselves into Area Zero which is why he forbids anyone from going down there. He also doesn't get surprised seeing your box legendary because he has seen them before already.