Rabbis are teachers, and Jesus was often called "teacher" by his followers. I believe the Aramaic word for teacher is something like "Rabboni". I'm using the term in a loosely descriptive fashion for Jesus too I guess. Granted the 2nd Temple was still standing so it was the priestly era and not the rabbinical era, but yeah, rabbi, why not. There are schools and social networks that maintain traditions and connections but the hierarchy as I understand it is pretty flat in the rabbinical system, which was only maybe in a proto form in Jesus's time.
As for the OT, yeah it's a pretty good source to fish out awful things, but I think it gets a bad rap for that so I always bristle at the assertion or implication that it's the "bad" part of the Bible. It's got a lot of good stuff in it. By volume probably more than the NT. The truth of the matter is that the whole book is self contradictory and problematic in parts with a number of good ideas sprinkled in. You'll only get something useful and moral out of it with thoughtful interpretation and careful exegesis. And I do happen to think Judaism does that well mostly.
What was the appeal of Plex anyway?