It's pretty obvious almost none of them. The Chinese civil war picked up millions of conrades along the way and there is absolutely 0 chance most, or even a significant portion of them spent weeks or months cramming a bunch of theory in their free time while working for their feudal/war lords before defecting

A lot of them just heard that the communists were promising them their own land, guaranteed nourishment for their entire family, and how much better their followers were being treated