I feel like unless there was some big major reason, Kyrie, Hayward, Theis and Larkin should all be there. They can miss a day of rehab if needed to be with their team and be there for whatever happens.
The thing you should ask, would KG not be at the game? Then hold those guys to the same standard. If they have some other major issue, understood. If they just don't show up, that is disappointing. Be with your team on the biggest game of the year.