Since you've now approached the end of the 2003 year of Morning Musume singles, I've become curious. Have you checked out the special singles from that year when they split into Morning Musume Sakuragumi and Morning Musume Otomegumi?
I haven't checked them out yet but I do know of them. I will probably go watch them at some point in the near future. But since they are not on the list of PVs up at the MM official youtube page there won't be any reaction videos for them.