 "Shōkaku" herself was unable to conduct further aircraft operations, with her flight deck heavily damaged, and she required almost three months of repair in Japan.Historians H. P. Willmott, Jonathan Parshall, and Anthony Tully believe Yamamoto made a significant strategic error in his decision to support "MO" with strategic assets.Since Yamamoto had decided the decisive battle with the U.S. was to take place at Midway, he should not have diverted any of his important assets, especially fleet carriers, to a secondary operation like "MO".