It sure sounds like this thing is going to start out as KCD, Spals-Geno-Horny (assuming Geno returns from witness protection), and Downie-Sutter-Beau.
First line makes me want to puke, but I like the third line a ton, and I think the second line will be better than people appreciate because you're talking about putting Geno with a pair of guys who will get him the puck, give him support, go to the net, create space, and play honest two way hockey.
That said, I think Johnston will juggle things a lot more than his predecessor.
I'm not sure that it will. I just don't see Johnston being married to lines the way Bylsma was. He likely won't pull out the old Therrien random line generator, but I see Johnston proving true to his words and being a 'pairs' guy who will prove flexible in terms of who completes lines. I just think he's not going to hesitate to mix things up if guys or pairs aren't going. In that vein, KCD might start most games, but I don't see it sticking in those games save a random Geno shift in Dupuis' place.