Choosing a wife (as goated as they all are), having a child, perpetuating the poison clan, and obeying his grandmother are at odds with this arc, whereas choosing Kinosaki and defying his grandmother and the clans' traditions is in alignment with this arc. It makes perfect sense for him to choose Kinosaki.
Well, no I don't see that as being at odds with this chapter. More like this is supposed to combine the two aspects. This chapter isn't about going AGAINST what the clan wants, but to do good for the clan the "right" way. He has always said that he's going to look after the clan, but that he wants to look for the perfect partner. What the clan wants and what he wants should NOT be at odds. And the story is building up to exactly that. Him choosing Kinosaki is explicitly at odds with what the clan wants.
(Small intermission. I am in favor of him being at odds with the clan if he wants to choose Kinosaki IF and BECAUSE he loves him, I am a liberal after all, and I put more emphasis on people's individual freedoms. BUT this isn't the point of the story.)
So, when we talk about the main of the story is that people desires and wants, don't have to be at odds with what society (in this case family/clans) wants. The two can find a perfect middle ground, so long as both find the answer in... well, love. Yea, that's the point. Choosing Kinosaki is strictly going against what the clan wants, and goes against the point of the original reason for doing this, when the story has yet to show us Gero is meant to go against the Clan, but rather to prove that his choice is positive to the clan. I mean, look at the Fire clan: a complete egoist situation lead to the destruction of a long lasting clan. Look at the pinwheel clan, when working together ends up building a close and loving clan. If Gero imposes his own wants above what the clan wants, this leads to the destruction of the clan. This is, as I see it, the whole message of the story. That one can actually reach a good middle grounds where the two sides becomes better together. Gero's teacher is the complete opposite of an ego, it's a complete "altruist" that is willing to sacrifice themselves AND his pupil for the good of the Clan and the Clan as a whole ONLY, not each individual member.
Heck! We have the perfect example of this not too long ago. Remember the old lady of the Iron clan and her lover from a small town? She said she loved her husband and she was happy with the life she lead, while HE did the same. And yet they both still loved each other and found a way to come back together because of love! This is it. This is the real message. Right there!
I hope you understand what I mean.