It's not certain. I mean Dragon Break Make things from all version happen at the same time. In one possible endingd of DF DoF has died, right, but in all other endings he survived. So after Dragon Break Dof both died and survived, thus DoF is http://en.wikipedia.org/wiki/Schr?dinger%27s_cat
The Dragon Break make's pretty much everything possible...it explains why Mannimarco is an Altmer at one time, a Lich in another, A god In one, and A man again.
Also it would seem that Mannimarco also knew the Identity of the Underking, Zurin Arcturis. Though It's a moot point since even if it's not Zurin its Wulfharth...and wulfharth and talos and zurin all make up the deity we all know and love as Tiber Septim. And once again the dragon break makes it all possible considering the whole time the underking exists Tiber Septim is already a God in the same Pantheon as Akatosh no less...
What confuses me is the fact that there have been several Dragon Breaks 2 of which were caused by the Numidium, and yet the one caused by the order is the only one we know how long it lasted? yet how can you really say it lasted or is over when in fact the shattering of linear time means you could at this moment be in a disorganized event of time. The only conceivable way you can say that there was more than 1 dragon break or actually calculate the amount of time it lasted is by saying that all three breaks happened simultaneously in linear time and all three were temporally linked with one another. Thus you can say that when the dragon break ended you could compare the current astrological patterns with those that were in effect at the time of the earliest Dragon Break.
oh silly me...by my count there's 4 Dragon Breaks... the 2 caused by the numidium, the 1 caused the the tribunal and the heart of Lorkhan, and the one caused by the breaking of the tower. Of course I could be wrong and not realize that the events of Daggerfall also ended in a Dragon Break.
sigh...when you break linear time it's never really fixed it just breaks more and more... even the elder scrolls are incapable of fathoming it.