If Yorktown had gone to the Asiatic Fleet in 1940, could Japan hunt her down and could she work with Force Z?
Short answerShe might retreat toward Force Z and cooperate with it, but Japan would be reluctant to detach only one carrier because the hunt would require concentration.
NotesIf Yorktown survived the initial Philippine crisis, she might fall back toward Force Z and cooperate with it. The difficult step would be bringing the forces together while Japanese operations unfolded around them. Japan would be unlikely to detach a single carrier for the hunt because carrier combat rewards concentration. Sending a pair would weaken the Kido Butai's main striking force.