Indeed. Olrox may have his reasons for aligning with the Vampire Hunters against Erzebet, but I doubt he will do something, even indirectly, that will give them more power. He needs their help, but only to fulfill his purpose…whatever that is.

And speaking of what Maria and Richter have to go through to even stand a chance against Erzebet, I can think of one thing that might give them a chance: Item Crush.