OTL Zuikaku did not sail with the Japanese at Midway because of air craft losses at Coral Sea.
However she could still could field 39 aircraft (out of an establishment of 72), and she had 16 aircraft or so aircraft non operational were thought to be repairable (lets say 8 are repaired by Midway, so 47 operational aircraft at Midway, a decent number.
Would the extra aircraft and extra deck change things at Midway.