Mad, I don't think the point is to focus on the intensity of abuse. Your experience sounds pretty horrific and may objectively be "worse."
What's truly interesting about this post is the idea that the tactics used are similar. The Watchtower as abuser and the member as codependent is a useful way to conceptualize cult involvement that is ultimately not in the member's best interest. So, why do they stay even as they suffer? The OP is suggesting that we can gain more insight into that reason by comparing abusive / codependent relationships since there is much that we do know about those kind of relationships as studied in the domestic sphere.