I have this head canon that Kyoutani is overprotective over Kunimi and Kindaichi
Like the moment he saw them he decided that he has to protect them
Someone's being rude to them, Kyoutani fights that person, they need help Kyoutani will help them
They don't think about it in any way ane they don't bring it up in front of the team, they just think Kyoutani's being Kyoutani
but little did they know