Well, with all reality setting in, this argument is moot: you can't have KLS as she wasn't able to play.
I have absolutely no idea why anyone is harping on the idea of a last-minute replacement being not up to snuff for someone who can't play. Aren't we all rootiing for the same team?
This I can tell you: Jackie Young is a marvelous all-round player who can sometimes defer a bit too much to her teammates (see, Ogumbowae, Arike; Mabrey, Mariina) until otherwise instructed. She is obvously deferring to her teammates here. Kara Lawson, I'm sure, will remind her of when to step up.
So, I'm all for supporting the U.S. team here: initally wth KLS, now with Jackie. Go U.S.
(My one counter to you is that there is a lot of varied and good passing in a game, whether 3x3 or 5x5. I've seen excellent entry passes by KLS and some superb drive and dishes by Jackie. However, KLS simply cannot handle the rock like Jackie, who can play the 1, 2 and 3 at the professional level. Nope.