Ibaka is dumb as shyt breh. He is all instincts. He doesn't play smart defense. One of my biggest gripes with OKC is their just an extremely long, athletic team who overwhelms teams with extreme length, athletic ability and talent. That's why the Spurs stay looking like OKC bytch when it matters because no matter how smart you play, OKC can use their length and size to disrupt your plays and sabo and Durant can't be stopped either. The problem is, Miami has more talent than OKC and even with a lack of size, Miami doesn't have to worry because neither Ibaka or Perkins can score an easy basket so basically it Lebron, Wade, and Bosh v. Sabo and Durant and of course, Miami will win that matchup easily.
It's all about match-ups. With Sabo healthy, you would probably see OKC losing to Miami in the Finals but winning the West.