Factual, the ideal outcome would be ruka, chizuru and sumi as wives and string mami on as a mistress because she doesnt deserve anything

I think ruka is best girl, but chizuru is still the right choice, kind of like re zero where emelia needs subaru more than rem(even though rem is best girl)without realising it. Chizuru NEEDS kazuya

I respect his self restraint to say the least, resisting something like that is a commendable feat.