The hassle I was refering to was the retraining of grown birds. I would not want guineas that have to remain caged all day. I like to watch them, they eat ticks, and of course have a better diet and eat less store bought food. I have mine in now because the few I have left are getting killed. They did not have enough time with a good flock to teach them to come home. As noted elsewhere, it's better to start over.
I wouldn't rely on your remaining Guineas to teach their keets to return to the coop each evening, or you may never have more than a few Guineas. A little effort put into some consistent treat training and establishing a coop-up routine with your birds can really go a long way when it comes maintaining a flock of Guineas that don't end up as predator food.
What a bummer that what's left of your flock now has to be penned/caged full-time (and possibly culled).