Genda was a very intelligent and clever chap, the only trouble is he was a bit of an oddball, a real hermit who would retreat into his cabin for literally days on end, not washing shaving or eating whilst he went over a problem. Total focus and concentraction.Agree he listened, Genda was a nobody .. The reason for the abort of the 3 rd wave was Nagumo was satisfied of teh damage done ( ie the BBs) and to a lesser extent fear for his carriers and 2 BB from a US CV strike while his planes were over PH.
Regarding Nagumo's decision to abort, he was naturally cautious in fact probably to much so, I always wonder what would have happened if Yamamoto had followed his gut instinct and replaced him with someone more agressive (like his no 2, Yamagushi I think his name was, he was on the Hiryu). True Nagumo did cite his reasons for withdrawing (in this order, although not necessarily in order of priority) to his staff officers :
(1). The IJN had already won a 'crushing victory' with the destruction of at least six battleships, numerous smaller craft and many land-based planes
(2). They did not know where the US carriers were. 'Even now, they could be out searching for us, planning a counter-strike'.
(3). (Perhaps the most telling quote of all, showing his true state of mind) 'This carrier strike force will be vital to us in the conflict that lies ahead. It is my duty to return it intact to His Majesty.







