protoss

Not sure if this is the right place for a noob question but I will try my luck. I just started getting into aos collecting flesh eater courts and have a question regarding Command Abilities. It's about whether, if I choose one of the four "Grand Courts", I keep the standard "Feeding Frenzy" ability and still get the additional one of the "Grand Court", or whether I can then only use the "Grand Court" ability, or choose the ability. With the Command Trait and the Artefact Power it says explicitly that the version of the Grand Court has to be used. Also the question if a General or Hero can have more than one Command Ability at the same time. Would be nice if you can help me.