I’m gonna respectfully disagree. Sunny has moderated the show multiple times before and not gotten into it with the other ladies. Plus, some of the most famous moments in the history of the show have been arguments between the moderator and another (usually conservative) co-host disagreeing about a topic.
Joy being an original co-host and working there for 14 years, then being gone for two years, isn't the same thing as Sara being a co-host for two years, then leaving for two years.