I just can't get why they call it "Guild orders" when your union has nothing to do with it.

Ok, "maybe" if there is no other event going on at the time, and your union has the corresponding guardian unlocked, they might set it to the the one that helps against the current GO boss, and, assuming you aren't using an off-element team, you can get a 3% bonus. But other than that, it has noting at all to do with your union.

If it is really to be a union event, they should put in union quests and union awards. For ecample, complete GO with Andro as soul. If 10 people in the union do it, everyone gets a star, for 20 people, 2 stars, for 25 people 3 stars, for 30 people, 5 stars. Maybe also give gems, regalia, cravis etc for different union quests.

As it is, "Guild Orders is just a huge misnomer. If Nutaku really has a unique game and not just a copy of an existing game, they should be able to implement this.