I don't agree with your assessment of those events. 3 letter services had very little control over the process of dissolution, and their attempt to stop it (the GKChP putsch) was met with decisive resistance.
Of course, in most republics local elites have cleverly kept the reigns of power in their hands, but those were the Party officials, not KGB officers. I think that Russia is the only ex-USSR country where KGB managed to seize complete control. Others are democracies (Baltic countries and, arguably, Georgia and Ukraine, maybe even Armenia), authoritarian states (Belarus, Russia) and a number of sultanates.
Of course, in most republics local elites have cleverly kept the reigns of power in their hands, but those were the Party officials, not KGB officers. I think that Russia is the only ex-USSR country where KGB managed to seize complete control. Others are democracies (Baltic countries and, arguably, Georgia and Ukraine, maybe even Armenia), authoritarian states (Belarus, Russia) and a number of sultanates.