Welllllllllll Rassilon was kinda going to destroy all of existence for him and his Time-Lord buddies, plus the timeline has changed from the "End of Time" until now to the point that the Doctor saved Gallifrey instead of destroying it.
The Doctor glosses over this. He basically says at some point they must have figured out how to release themselves. Basically a plot for later.
a Combination of Rassilon not thinking he would tell them, that he wouldn't help them, and I think they were trying to make sure he didn't know who was asking.
I'm pretty sure it was. I believe The Doctor called him that.
Google is you friend.
I still don't think its anyone from this season. I'm kinda hoping its either Donna or Meta Crisis 10th Doctor.
So much glossing over things in this finale. And that's a really, really big one.
The newly released from being trapped Time Lords obviously can reach out to people to do work for them. Why not just have them get Ashildr to ask him? Why even think about interrogating him in the first place?
So THE Rassilon.... the guy who basically founded the Time Lord civilization, the guy who brought the Eye of Harmony to Gallifrey, the guy who invented the TARDISes, the guy who created the genetic links that allow Time Lords to travel through time.... that guy..... is basically told to shove it........and everyone listens......? How did Gallifrey go from "We’d be lost in another universe. Frozen in a single moment. We’d have nothing." to "We love you Doctor, you are our new President and we will exile FUCKING RASSILON for you"?
So yeah. Saving them all opposed to the guy who was willing to destroy everything ever,
not a hard choice to make.
Granted, I didn't like how guy-I-now-know-as-Gus-from-that-shit-Jekyll-show-on-ITV was a far less imposing Rasillon than Timothy Dalton, but hey it's hard to top Timothy Dalton.
Plus, this sets up Rasillon as a future baddie to return.
Guy's evil you know.