I challenge someone to find a list where he is top 10 free agent. The highest I have seen Turner on a list of 2016 free agents is 27th. Even if you want to remove restricted he isn't higher than 18th.
It couldn't possibly be that other teams didn't want to trade for Batum knowing he'd get THAT kind of contract a year later...
Fair enough but consider the 26 ahead of him on the list would not sign in Portland and you have the top free agent