Sakurako looks up to Akari and is one of the only two people in the whole series - anime or manga - who always notices Akari, appreciates her, and never insults her for her lack of presence. The other is her older sister Akane. If Himawari got fed up with Sakurako, Akari would be a good back-up girlfriend. And Akari's only other serious prospect is Chinatsu. Himawari may be a femme bombshell but if Sakurako cut her hair like Nadeshiko she'd be a good prince for Akari.This is a very possible pair. All of Akari's possible girlfriends have one already, admittedly, sort of - Sachan has Himako, Akane has Chinatsu's sister, and Chinatsu has Yui, but of the three Sakurako would probably make the best couple with her.