It'd be a nice idea when Chronoa's importance in existing for the DB Multiverse as a whole cannot be understated, though there are some problems with the theory. The most notable one that comes to mind is the lax security surrounding Chronoa when her life and Zen-Oh should be tied by what the theory dictates, yet neither Zen-Oh nor the Daishinkan nor the former's attendants provide any sort of guard to what'd be the perfect way to usurp the throne to the multiverse despite there clearly being threats that could put her life in danger such as Demigra, Towa and Mira (and far more dimensional travelling beings in Heroes material such as Mechikabura). Of course, that's for the meta reason of them not being thought up at the time, but not even some kind of throwaway excuse is given to plug this hole in the theory.