Also for anyone wondering about Tag Indices or Datum Index
Look into Assembly - The Blam Cache Research tool (ofc )
Open up a map (say shared.map)and select any tag , The Information Tab lists the required DatumIndex
Spawn them and change teams. They're in the same team as the player who spawned them...that's the only way I know how. There are other ways that involve custom maps but I don't know much about that.