The Splitting of the Losties

As we all saw in the premiere, to Losties split it up into 2 groups - Locke's Group, and Jack's Group. It's near certain that Jack's Group were the ones who got off the Island, because of what we have seen in the flashforwards. But what if we slow down - Hurley said to Jack "I should have gone with you" before shouting "It wants us to go back". These two statements are contradictory, so maybe Locke's Group fell into some trouble and perhaps something happend to them.

What was before unclear was which group Sayid belonged to, but after close inspection of an HD screengrab - it seems that Sayid is part of Jack's group. This brings up further questions - if it was Jack's group that got off the island then why is it only 6. It is clear from the screengrab that there are many more than 6 members of Jack's group...Maybe they decided to go to Locke's at a later date?

I do think that the 6 who got off could well have nothing to do with the 2 groups, but something must have happend at some point for only 6 to be able to get off the Island, and when it happens I guess it's gonna be BIG!
Source: BlackRock.org