I find the interview with Jurgen posted above by Democritus very interesting. He doesn't say there are no impact marks on the island, he says there are no significant impact marks on the island. The interviewer asks about wreckage that is on the island that could not have come from being washed up. The pinger has been located approx 60 metres offshore from the island.
I'm not saying they hit the island. There are other scenarios that would allow for wreckage to be on the island above the water line, one of which would be CFIT into the water close to shore with wreckage being scattered, but I do find his comments interesting.
That island must be one of the most inhospitable places on earth! Searching those cliffs for evidence and wreckage will take a good amount of time and will be treacherous!