Good analysis and for sure it could happen exactly as you point out but one quibble: GSW stopped Westbrook and Durant from getting to the rim by packing the paint and seeing if Roberson, Waiters, Ibaka (et al.) could beat them from 3. And as D(J)BMH mentioned, the role players reverted to their norms and OKC was basically undone by math: i.e., they couldn't make their 2s at a high enough pace to offset the 3s that GSW were making.
This current incarnation of Cleveland will be the best shooting team that GSW has faced in the playoffs. Will that be enough? Probably not. But CLE does present some defensive problems with Irving, Love, Frye, Smith, and (maybe) Shumpert being able to shoot at a high percentage and LBJ having the ball in space. The question is whether they will be able to get enough stops.
BTW, here is one play that GSW is going to see a lot in Game 1 -
http://www.sbnation.com/2016/5/26/11781600/cavaliers-lineup-lebron-james-channing-frye-breakdown-backup - when CLE has a lineup that has been pretty effective on the floor: LBJ, Frye, Jefferson, Shumpert and Smith/Dellanova. LBJ will set up on the right shoulder, Dellanova handling the ball and setting a back screen for Jefferson, and Frye in the opposite corner. The link goes through the available options.
Most of all, this should be an interesting coaching matchup.