it's true that there's no specific evidence that kyoya is romatically interested in haruhi right now. but i think as the manga progressed and kyoya understood her more he began to care for her as a friend. i think the author is making little moments for all the host club members and haruhi, weather their romatic or not. But feelings can change so maybe later haruhi/kyoya might exsist, maybe not. But the fact is that no one can say 100% who haruhi is gonna be with, if she's gonna be with anyone, Until the last chapter. or the chapter where is becomes 100% for sure. I think it's just fun for ppl to explore the possibilites in the meantime.