I find it difficult to communicate with you.
It is easier to convince the Pope that there is no Jesus Christ.
I think even if the Zen and Medaka married, even if they show their wedding night, and so on you'll be say "I do not believe it."
We read one and the same text.
"If Zenkichi did not love Medaka romantically" Hmm ... Of course it's after Zen said I love you (Medaka) - will you marry me. Of course for you are not an argument.
I have only one suggestion - write your manga, where the Medaka will love Kumagawa. But not in this universe