Mr Light wrote:
Hell, it's very likely that it's BECAUSE of our time traveling characters that Chang/Dharma will learn of the possibility of time travel and thus construct the Orchid, creating a chicken/egg scenario.
Not quite a chicken & egg scenario since the main cast never use the Orchid to time travel, rather they use the ancient donkey Wheel that is hooked up to a giant... machine that can cause time travel (Maybe an Alien starship's engine? A time machine from the future that ended up way in the past?)
We don't know what type of machine causes the time travel yet, but... we do know the wheel and time travel were possible in the distant past of the island, way before Dharma ever got there or even built the Orchid.