I apologize for being late to this thread and I do not know if this issue has already been brought up (if that's the case, please advise, thanx):
Were the Kelvans brought to a planet of their liking and isolated / quarantined like Talos IV or was their superior technology (e.g. warp drive) added to the Federation's?
I do not know how far Federation ethics and principles extend, but this must have been an issue I can imagine the Federation members having had several months of discussions on Babel...
Bob