Maximara:Also doesn't this lead credence to the idea that the Jesus movement goes back to c100 BCE which supporters dismiss with the same argument from silence arguments used against the idea there was a historical Jesus?
I'm not arguing from silence for anything.
I was just noting that it's not odd for Hebrew monastic adherents to not go on at length about individual figures and instead to spend a good deal of time going on about the ideals of how to live life "right".
The Qumran group actually makes a point to not even mention their leadership by name at all, nor use any title from that teacher as a description of their following.
In Hebrew culture of this time, creating idols out of leaders was a big taboo; it's even an idiom of their culture: "Morning Star". The idiom was comparing leaders who wanted recognition and following with Venus in the sky attempting to outshine the Sun as the supplier of daylight in the morning.
You misunderstand my question. One of the main arguments by apologists for Christianity predating Jesus c29 CE is no one mentions it (ie argument from silence). But if these groups were as secretive as you state then it is totally possible that Christianity goes all the way back to c100 CE.