Howling:Post-Survival Master

So there's 3 theory's about what happens to the master after survival, there's the one where he tries to find a new regeneration cycle (the Virgin New Adventures version),there's the one where the Tremas master persists (the BBC Books version) and there's the one where the Tremas master is lost/ the one where The Keeper of Traken is undone (the Big Finish version). I think that the most explainable would be the Virgin New Adventures theory but the BBC Books theory is good but there's a big gap and no explanation to cure of Cheetah virus.