 Yamamoto's decision meant Japanese naval forces were weakened just enough at both the Coral Sea and Midway battles to allow the Allies to defeat them in detail.Willmott adds, if either operation was important enough to commit fleet carriers, then all of the Japanese carriers should have been committed to each in order to ensure success.By committing crucial assets to "MO", Yamamoto made the more important Midway operation dependent on the secondary operation's success.