The gradual dismantling process was not set in motion with a plan of dismantlement. That was an unplanned outcome. I'm not sure what you mean by "relied entirely on the state's administrative apparatus for the execution". Inaction or insufficient action in the face of separatism is mostly down to the top, rather than the apparatus (although, again, there was a coup attempt); and at least a significant part of the apparatus going along with the formation of new separate state administrations is nothing strange, either (what else would they have done?). At this point, my question is: what is your minimum standard for the collapse of an empire, then? (As in, example of the least dramatic dissolution you still count as a collapse.)

_{*Lunatic*, n.
One whose delusions are out of fashion.}