If KD wants to pretty much guarantee himself a title, he should consider it.
Maybe pull a LeBron and play for Warriors for a few years, get some rings and bounce. Chris Broussard on Sportscenter said that the Warriors are a dark horse candidate to make a run a Durant.
You could plug him in at the 3 and I am not sure how you would be able to ever stop the Warriors from scoring 110+ a game. KD would have to sacrifice a bit of his game, but so did LeBron.
The question Durant has to ask himself when free agency comes around is if the Thunder can win the Western conference with the team they currently have.
Also, he needs Russell Westbrook to be honest with him about if he plans to leave in 2017.