As for the single set - OK, it can be a couple of sets of the same couple of models (I still think that a single good set with enough pics should do the job, but a couple of sets will not ruin it too).
About who should call the shots - well, "Whoever pays the piper, calls the tune".
In this case that would be Lensman
(who looks like a pretty impartial party too).
Cheers,
Machine