Ok... well the people in the canoe.... this is only a theory but its based on a fact.
The oceanic 6 take another flight with Ajira airways, flight 316 and crash again on the island in one of the next few episodes (this has been confirmed!) . Now if you look at the waterbottle found in the canoe/outrigger it was an ajira airways bottle, so those people are either the oceanic 6 or who ever was on the plane with them