Anyone consider he is the one who sent Bram to island ? Bram said he could explain to Miles why he is the way he is. That could be an sign Bram knows Pierre. Also, could Pierre be the scientist Eloise said was the clever fellow who built the lampost ? Pierre went by Halliwax too, and there was that winter jump suit Ben buts on under the Orchid that has Halliwax's name on it. That would show that he knew about time travel and how to leave and return to the island.