If at all true and given CoAS is out of the country, the CJCSC could technically command the army leadership. Just depends on the collective appreciation of the army leadership to realize how many unprecedented things have happened in this country in the past 8 hours.
Honestly, such step from within the military will be harmful for Pakistan simply on account of the precedent it would set. However, given the complete state of anarchy in the country, we may not have too many choices except CJCSC sets direction, provides guarantees of IK's safety, calms the situation down, forces PDM to fold and gets the elections in motion....HOWEVER, there are far too many spoilers in all of the above.