Just think - it literally took two separate blown 3-1 series leads for him go there.
If OKC would've not choked and went to the Finals, he would've almost certainly resigned in OKC.
If GS would've not choked and won the Finals, he would've almost certainly signed somewhere else, according to reports.
Thus, both parties choking allowed them to team up. Go figure.

The pressure on them is going to be absolutely crushing. They will be absolutely crucified if they don't win it all, but I would bet money that they have a 2011 Miami Heat type of rough season.
They also have so many questions to answer - Who is their starting center? What kind of supporting cast are they going to be able to surround themselves with?