Seems to be a bit complicated. There's a Takanah from Usha that we don't put an av beis din in nidui (Moed Katan 17a), and Hagahos Harosh there says that we don't depose him either. R' Aharon Levin suggests that this Takanah may not have existed yet in Rabban Gamliel's times (he also says that maybe it was introduced by Rabban Shimon ben Gamliel after R' ...


I'd suggest the community on Reddit, at r/Judaism. Keep in mind it attracts people from all kinds of Jewish backgrounds, not just those of Orthodox extraction.

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