With respect Lisa I must disagree with you.
Michael was provided the right to reign by the
Abdication Manifesto which Nicholas signed on March 2 at 15 hrs 5 min 1917. All inheritance passed to him. This Manifesto was an
official legally binding document, plain and clear. Technically there was no legal vacuum because succession was assured.
So by virtue of this document Michael was the new Emperor.
The fact that he
renounced all his Imperial rights handed to him hours before could only have been come about by being the Emperor no matter what period of time had elapsed.
It was Michael who broke the chain of succession. To achieve this legally, he signed his own Abdication Manifesto on March 3.
Emperor Michael's final deed was to effectively cause the collapse of the Romanov dynasty in Russia. He seemed to have expected to rule as regent to Alexei, but refused to rule in his own right. The reason could lie in his own belief that Alexei's removal to rule was contrary to the
Laws of Succession. He questioned the legitimacy of this act.
Michael knowingly submitted Russia to the republican cause. This he did because he was informed that his personal safety could not be guaranteed. He was effectively an Emperor without a government while being surrounded in the streets by a mutinous Army calling for destruction of the monarchy.
So he really did decide Russia's fate (future) on advice of the Committee at the fateful meeting at # 12 Millionnaya Ulitsa.