@Mister Bad Guy: What do we gain from including Kyosuke in our circle of friends?
1) Becoming Puella Magi looks less attractive, since there won't be a case of "all my friends are puella".
2) For those who are Puella, they are more closer to the regular people who get eaten by familiars and witches by having common interests with them and also interaction in that sphere of life.
3) We've been talking about Mami making friends for how long? (Also, regarding Mami healing in specific, if Mami can get over her crush of Sabrina I consider it a success - and if she can't, it still works as friendship.)
I mean, sure Kyosuke has his issue in liking Violin instead of gossiping, but that's not all there is to him - or he wouldn't be friends with Sayaka and Hitomi (+how familiar is Madoka with him)?