Let's keep in mind what we know from Ben's California Closet. He travels with style and panache. His itinerary was likely well thought out, and his wardrobe chosen, appropriate for the conditions of the trip. This lends support to the conclusion that he teleported, as had he known he'd be leaping from a plane, he'd have worn a jumpsuit, a parachute, etc.
As to the coincidence of Ben happening upon the two Bedouins immediately upon arriving, I think it highly likely that Widmore knows about the potential teleport locations, and hired these two to intercept anyone who comes through. However, knowing that it would likely be Ben teleporting, Widmore likely left orders to apprehend, and not shoot to kill. Unfortunately for them, they are Bedouins, not trained in the sneaky art of warfare that Ben is good at.
