Disclaimer: Various evil companies who cancelled the show own them, not me..
The reality without Scarrans is almost too easy to find.
Perhaps the plague destroyed the species instead of causing mass mutation. Perhaps they failed to perfect interstellar travel before their natural resources ran out. Perhaps they ate each other.
He is looked upon as a curiosity, although here he is more of an abomination than ever. In all the universe, he is the only one who speaks the Scarran language, remembers the tales, knows the blood rituals.
Scorpius is never tempted to leave things this way.
If reality settles into this shape, then nobody will know that he has won.
The End