@Lilliwyt Jealousy is a bitch, when you get it, you can't help it, EVEN if you logically understand and support the pair yourself, your feelings care not about for your logic. In the end she does reign those in on her own, as you saw, and there was no problem.
And Kino. Well, you see, Kino uses the word love (Suki, most likely) way too freely, this is bound not only to cause misunderstandings but even bad feelings between the parts if not careful. She didn't know that, which led to the start of this manga, now she does, which leads to her being extra careful around that word. Because it would be rude, plain and simple. When someone tells you that they love you, but they NEVER mean it in a romantic way, the day they actually do mean it like that you just won't believe it, because you're already disappointed from all the previous ones: It loses its inherent value. No one, ever, likes empty words.
In short, Mizuguchi be jelly and can't help it because feelings are a bitch and Kino does not want to belittle the "Love" that Yori is so desperately trying to convey to her by using the same word to talk about something different.