Here's my thoughts, Kate has been banish by Locke so just as she leaving Sawyer/James place she runs into Claire and Claire decides to go with Kate. Hugo overhears Kate from her talk with Sawyer he joins them. They get back to beach and possible second helicopter has been send by the freighter that'll carry more people. So Kate, Jack, Claire, Aaron, Hugo and 2 others I hadn't figure out yet. On the way to the freighter they run into trouble and Claire and one of the other 2 gets knock out of chopper, but Kate is able to grab Aaron at last second or is holding on to Aaron.
I'm basing this upon what Jack had said in court that there were 8 but only 6 makes it back.
I'm going to mosey on back into my little corner now, hope I hadn't confuse some withn my thinking.

__________________
Standing in the ocean with the sun burning low in the west
Like a fire in the cavernous darkness at the heart of the beast
With my beliefs and possessions, stopped at the frontier in my chest
At the edge of my country, my back to the sea, looking east