I have a feeling that the Errata from FAQ document is designed for skirmish, not campaign. I haven't played with Rebel saboteurs much, so I can't tell about them. But it's clear that Imperial Guards doesn't work as intended in multiple missions.
On one mission you have two guards staying alone in a separate hall, guarding the prisoner. That would make sense if they could buff each other and thus act like tanky minions to hold rebels a bit. But errata says that they can't so they are just pretty useless there.
On the agenda mission "Breaking point" it becomes even worse. You have Royal Guard champion which is your only hope in this mission, and two common Royal Guards, who seems like should be protecting him. But they can't since he is a guardian too, so they don't help much.
Am I the only one who feels this way?