"Where are you getting that multiple companions can be used?"

KOTET "uprisings" can be done with 1-4 players the fewer the players the more companions.

I am afraid you err. Uprisings are simply the old, well-known and proven-to-be-working H2+ Missions in a new dress. It can take you, you and your compagnion or you and friends with the compagnions raising the total number to four. There is nowhere any indication that you can have 3 compagnions with you, who do all the work for you; in fact it is enough to have ONE compagnion who already does all the work for you, why would you need 3?