I guess I don't see how her return will mean less screen time for the rest of them. She was on the show for the entire time (in a lesser capacity, yes) but we have gotten to see specific backstories on other characters, too. I think the writers understand (and Erica, being in charge now, understands) that this is an ensemble show. As much a fan of JJ as I am, I wouldn't want the show to become entirely about her. Part of CM's goodness is its well-roundedness and the talent of all the people in the cast.