What if O Brein was a triple agent, and the brotherhood is real?

This theory has been posted before, but not sure if it was here. I remember some of the points being:

The torture was a test to see if Winston could withstand torture and actually join the brotherhood. But he didn’t pass. This makes sense, because: why would they just let a random person like Winston join it, for no reason at all?

He has the cover of being a party member. He explicitly says that is his cover.

He went to extreme lengths with Winston, a waste of time for such a seemingly common person. He could’ve imprisoned and torched Winston and Julia much earlier if he wanted to

I’m sure there are more points but I just can’t remember. Thoughts? Flaws?