Hmm. I don’t know about the last part. If Regina did team up with someone like Ursula, it wouldn’t be to go after Rumple or even Snow. The focus is Henry. That is what unites them right now. I think Regina will have a whole different idea about how to save Henry from PP and that is what what will lead to conflict. I’m not saying that she isn’t upset over Cora still, of course she is. But that has been bypassed by the need to save Henry: it’s what brought them altogether in the first place.
And Regina knows that Rumple is still the Dark One. She cant do anything to him while he has his dagger.
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"He was a lot of things to me" "The only conclusion was love"