It's fair to question the Empire's intention here and I'm pretty sure likely pretty much everyone in the story is likely going to have the same concerns. I very seriously doubt either Doma, the Alliance, nor the Scions are going to be jumping at the chance to work with the Empire without keeping those involved on a pretty tight leash.

Though if this is the guy from the previous stinger in 4.1 there may be more to his own intentions then what will first be shown.