Komi sure has helped other people find their closest friends. I don't know who is Komi's best friend is as of now, but it is certainly between Tandano, Manbagi and possibly Najimi. I do feel that the girls are blowing it out of proportion because I do think Tandano likes Komi most, but he has the sense of mind to know that as she didn't have many friends and interactions with other males it may turn out that she is more compatible with someone else, though that is my opinion on how I see how he is written and being the reader makes that hard to see if you don't stop and think. imho I still think that Tandano and Komi would be the best match, but it will be weird when Tandano's little sister and Shosuke get married