Again I point out the Shenyang/Mukden incident that triggered the Japanese invasion of Manchuria. Three Colonels and a Major, Colonel Seishirō Itagaki, Lieutenant Colonel Kanji Ishiwara, Colonel Kenji Doihara, and Major Takayoshi Tanaka had laid complete plans for the incident by May 31, 1931.
At Dalian in the Kwantung Leased Territory, Commander-in-Chief of the Kwantung Army General Shigeru Honjō was at first appalled that the invasion plan was enacted without his permission, but he was eventually convinced by Ishiwara to give his approval after the fact.
Status of Kwantung Army was equal to IJA and IJN.
It did not necessarily have to consult with Tokyo each time but had to report what it did afterwards without delay.
So, they had thought that anything could be allowed if it was successful.