That the other three Schools outside of the Gelukpa sect as well as two schools that they did wipe out and the groups like Chan and Pure Land they forced out, should not exist. The Spirit was a "wrathful bodhisatva" who killed the protector deities of the other Buddhist groups. Basically, a God of sectarian war.

Not so good when you need to build a united front post-exile. I mean, there are many of the bloody painted wrathful BOdhisatvas kept around.

It's the "one true way" type of Buddhism that develops periodically.