The codadict split was largely in part of (and I am intentionally being very vague here as if you dig it gets ugly and that doesn't need to be discussed here) a disagreement on the additional policies that moderators need to follow, religious laws ( https://en.wikipedia.org/wiki/Electricity_on_Shabbat ), SE management at the time, and the broad SE community consensus. To put it lightly, it is a mess. If you want to find an external source, Jon Ericson's one sided retrospective is a starting point.

It resulted in one of the more popular moderators leaving, joining a site/project in development and having a pull on the related communities to shift there.