I don't think the subunit is necessary, and may not be a good idea even if the songs are good. They have done solos, duets and such in concert......so why is it necessary to make a specific division? Seems like this will just reduce the flexibility that the group as a whole has. It's as if only these three can perform together, and not with any of the others......so for example, Jessica is now banned from a trio with any of these three. It just sets a bad standard.