Ha! That actually WAS the resurrected Rassilon, per RTD. The Time Lords brought him back just as easily as they brought The Master back from his death in the 1996 movie. A body is easy. But, the Gallifreyan Matrix...repository of all Time Lord brain patterns and knowledge...that's what holds the mind/"soul".

Now, with the Matrix gone, I'd imagine any death past regeneration is permanent, finite death....