I think it would be smart for Ethan to align with R&R because the women are probably going to be gunning for him, as well as trying to break up the men's numerical advantage now.
OTOH, it might be smart for Rupert to go with the women and vote off Ethan. That would leave Rupert the sole strong guy, and the women couldn't vote off Rupert and hope to ever win a challenge again. Plus Rupert will probably be providing food by that point. It would almost guarantee Rupert making it to the merge. Rudy is no physical threat to anyone, so he better stick to Rupert like glue.
I don't think it looks good for Ethan if they lose another challenge. He better win over the men & convince them to pagong the women.