I'm wondering if anyone has experience with a scenario like this:

4 passengers on reservation
Lead passenger is Elite 100K.
Lead passenger is unable to fly and needs to cancel.
Other 3 passengers intend to travel.

Bags are already selected and seat assignments made as a benefit of the lead passenger's Elite 100K status. If he cancels off of the reservation, will other 3 passengers keep these benefits? Would it make a difference if he just no-shows at the airport versus cancels in advance?