I'm not against Westbrook winning the MVP. But IMO, getting a team to the #3 seed with 55 wins is more impressive than getting a team to the #6 seed with 47 wins.
Even if OKC exceeded expectations by 15 games while HOU only exceeded expectations by 10 games. Win # 53, 54, and 55 are more difficult and more impressive than win # 45, 46, and 47. The better the team is, the harder it is to rise further in the standings.