Hmmm no idea how the end works but I would think as it starts to whittle down you wouldn't want the strong there because they might beat you to the final treasure. Then again with the choosing of sides being (supposedly but who really knows?) random that might be too risky to do.
In Survivor, isn't it in your best interest to eliminate the big competitors quickly? Like Ozzie. So they don't beat you in the final one. Since this show seems to be Survivor on the High Seas, might be the same thing?