Desmond time travels differently
I hope that this isn’t a useless thought, but I am confused as to the reason for having diffrent methods of time travel. The first time time travel was introduced was with Desmond. In the episode when Desmond was on the freighter and was time travelling, his body never physically left the freighter. In fact, Daniel Faraday explains to him in one time travel journey that it is the conscienceness, not the physcical body that travels. Given that, why did the island disappear when the Losties went back to 1977 along with them? Is it that the Island itself time travelled? Desmond could just time travel at will essentially, yet in the case of the Island, the donkey wheel had to be moved to enter another time period. Any thoughts on this?