I have really enjoyed season 3, and have found it challenging at times which I like. Jack has always proceeded as leader from the beginning. He denies it, rejects it and pouts about it, but in the end he always takes control. Sayid, Locke, Sawyer have always challenged Jack's authority along the way and so it will be continued with the Juliet situation and it offers a good balance. Sayid will bide his time, and keep his eyes open to the possibility that Juliet is a plant. Kate certainly doesn't trust Juliet, but probably for more personal reasons than logical. The lack of communication among the losties is frustrating, but it is a reality about humans in general. We all get wrapped up in our own perspective, it is our nature.