I think that kanariya is the exception here. It can't be really included as the best of because it has never been performed, so it counts as an old song which people want to see live once and for all, since it is the only single that's been neglected until now!! Such a long time
I don't know if she can pull it off with those really high notes, but I'm sure they'll do their best to make it sound good if they include it in the final setlist
Similar case with ever free I guess, I'm not sure how this song ended up in the top 50, but I think it would be one of the best songs that they can include, because it is pretty nostalgic, it would be interesting listening to ayu singing it now with her current voice, and also because the lyrics are so damn powerful and touching, I could totally see her opening her heart and making everybody emotional.