Hans has been out of jail for at least about a week or two in the story about now. If I remember correctly Hans was released took Corrin out, left, went back to Nohr, and then was sent into the army and became a general somewhere around the time Corrin was either in the ice tribe's location, or just shortly before Cheve. I sincerely doubt he'd be able to gain any command that quickly. I'd suggest switching it over so that Iago is the man on your hit list if you really need someone important to gun for. I'm not trying to make this hard for you that's just the way things are in the setting right about now. If I'm incorrect feel free to show me that I'm wrong on the matter of what's going on in game at this point in time.

If you're adamant about using Hans then roll it back at least several years in your character's story. That was before Hans was arrested by Xander and his enrollment into the Nohrian army. Of course he'd be a common criminal and not a soldier.