Suave and confident Miyako is ultimately dangerous, I appreciate. Once Hinata became older that'd be trouble for Noa since Hinata might unknowingly charm other girls. Tlr: The sisters is dangerous when they're confident. I approve!
About the "hana yori dango" phrase, it actually originates from ohanami itself. It's a semi-humorous remark on how the event is nominally about flower viewing, but people really just attend it for the food and sake.