Was any team spotted leaving the airport in Phuket? Is there any indication whatsoever that at least one team, at the very least, was headed toward the exit of the airport?
Having been there myself, I know that there's only one terminal area and one place to catch a taxi. Because it's a popular tourist spot, there are tons of Western travelers at the airport. They would have been spotted, even if leaving Phuket proper...they would have been noticed leaving the airport.
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ETA: The bigger point I'm trying to make here is not whether leg #4 is Phuket or not, but rather to find out what criteria, if any, is being used to determine what is speculation and what is confirmed. Usually it's the latter only after there's photo evidence to back it up, and/or more than one person tweets about it/posts a facebook update. Otherwise you're relying on one person's tweet with no evidence, like that jared kid at the start of this race....and we all know how that turned out.
Is there not some sort of standard used for making such distinctions? If not, shouldn't there be?