Yes, do quarantine 'em. But how nifty to get the chance to add layers to your flock!! They'll kind of help teach the youngsters when their times come. (As in where eggs are laid, in nest boxes, not on the ground in the run, etc.)
After quarantine well away from the rest of your flock, and if nothing crops up, then you put them in a separate something, smaller coop, a dog house, or something, and put up a temporary - chickenwire works for this - fence IN the run, separating the ladies from the girls. For about a week, maybe two. This gives them the chance to see & hear each other, maybe meet and chest bump, peck without causing injury, through that fence. When you remove the fence, and they all mingle, there will be less nastiness. "Oh, it's just you, not some strangers."
It does involve having alternate lodging for them in the interim. But it's so worth it!
Good luck!