They can resurrect their ships and respawn them at their capital world and resurrect enemy ships to help them fight during a battle.
Global Unity ability lets them spread culture without a Temple of Communion. This makes a total of six major factions in Rebellion unless you include the Pirates, but they aren’t a playable faction.
SINs of a Solar Empire originally started with three different factions that eventually, as the game progressed, split into two different sub-factions each, Loyalists and Rebels.
