The only thing I can really think of is that Sano never thought that he could take Spitfire. So his window opened when Spitfire died. Because Nike really wouldn't kill him (obvs.) if he was part of Genesis and loyal to Sora. So he faked his Death, took it as an opportunity and stole the regalia from Kazu, who wasn't nearly as strong as Spitfire at the time.
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The only thing I can really think of is that Sano never thought that he could take Spitfire. So his window opened when Spitfire died. Because Nike really wouldn't kill him (obvs.) if he was part of Genesis and loyal to Sora. So he faked his Death, took it as an opportunity and stole the regalia from Kazu, who wasn't nearly as strong as Spitfire at the time.