-The island supposedly tests their ability to overcome adversity together, but we don't really see that until the final moment when they open the gate (I guess we get the brief moment where they link hands during the sandstorm, but that could be any six people). And upon receiving their powers, we're never given a compelling reason for why they have to function as a team. We get a brief Knights of the Round table moment followed by nada. Ultimately, we never get a glimpse of what made these six people good candidates to receive these powers together, and a couple of them aren't even fleshed out as individuals.
-This stems from the above, but why did everyone go along with Sheldon's code? Walter accuses him earlier of undeserved devotion, and the table scene seems like a perfect time to hash out a compromise that would have worked for everyone. I get that we wouldn't have the current conflict without that moment, but it feels like an excuse more than a natural progression of events that would have followed those six receiving their powers.