muSLR Just to put some perspective to it: this isn't really how casting/shoots work for us. Might be different for other studios/sites, but we (basically) have a team that shoots in FL, a team that shoots in LA, and a team the travels between LA and Vegas.
With virtually any casting that is booked and shot, it's not a matter of "why did X team shoot it instead of Y or Z team?" - it's a matter of "if X team doesn't shoot it, we may not have another chance for months" based on booking schedules, performer's travel schedules and availability dates, our own teams' travel schedules, etc.
And as always - a scene by any one director/team does not preclude the performer being shot again by another team.