http://www.sirlin.net/archive/playing-to-win-example-survivor/
Back on topic, I think Ken made a poor choice. In the short run it was great, but in the long run, not so much. Kelly is weak, and the next time she makes the tribe lose or pisses everyone off, the rest of the tribe is going to point at Ken. After Kelly's gone, Ken's going to become the scapegoat.
I actually think it's the other way around. :/ Keeping Kelly has short term loses and long term gains. Though she may be weak and will lose them challenges (which means losing food comfort, members, etc), they(being, the Fang alliance) need only to put up with her for awhile before they merge. Then it all becomes individual. So long as the GC-Crystal-Ken-Kelly alliance holds true, they can make it through to the end and get a shot at winning. Keeping Jacquie would be much more of a risk. She's strong, yes, but her ties to Koda would be dangerous and unwanted when the Fang tribe is put on the ropes against Sugar's immunity idol.
Also, I doubt any of the Fang alliance vote for Kelly now, or anytime soon for that matter, no matter how bad she fares in the challenges, especially when they all voted for Jacquie over her. Her vote is what will help them win against old Koda and the immunity idol. And, once they make it far enough that her vote doesn't matter, they can kick her off.
Ken d0 g00d.
BTW, can anyone make a gif (roughly the size as the one in my sig) of Ken "raking" the water during the immunity challenge? I'll credit you and be your best friend forever. <3