Plan
Professor Nii had planed everything. It doesn't matter to him if Gyumao was resurected or not. Because even if they were succesful, he had no doubt that the Sanzo party would kill the demon before he can become powerful again.
He just need to discover how to resurect the demon, because if he succeed then, he would be able to realise his dream.
Sometime he wondered if he could not have told his plan to Sanzo. If he had known what was at stake, maybe Sanzo would have helped him, instead of fighting him.
But he was selfish. He don't wanted to share.
Even in the past he was jealous of Koryu. And he still is now.
Komyo would be his forever, and no one else. And he would destroy the world if he had to. For his dream to become real, no cost was too great.