Pretty much this. If you watch Rousey talk about any other fighter besides Tate, it's all respect. The two just don't get along, and Ronda isn't afraid to tell everyone how she feels about it. If Zingano was the other coach, it'd be a totally different show.
Only partly true IMO. I agree that it would have been different because Zingano seems pretty laid back.
I don't agree that there's something particular about Tate that draws out the worst in Ronda.
All it takes is someone to speak up strongly for themselves in relation to Ronda. So far there has only been two female fighters who've done that: Tate and Cyborg, and Ronda has raged and ranted against both of them.