It certainly explains his batshit plans and the way the Time Lords turned monstrous during the Time War.

It would also explain the return to prophecies a la Sisterhood of Karn, as Rassilon was, IIRC, the bringer of serious science to Gallifrey. His casual insistence on blowing away any opposition would explain the Time Lords to me - they pretty much were left with a choice of extermination at the plungers of the daleks or the gauntlet of their own founder.