To me tho, this has been the difference between Harden and Russ when it comes to MVP. Look at the play Russ makes vs the play Harden makes to close the game. I can show about 5 or 6 games where Russ this year lost a close game/blew a lead on launching a stupid ass shot.
Also the team record makes a huge difference.
Just to play devil's advocate

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To be fair to Westbrook he scored 49 points on 47% shooting (8-15 from behind the arc) in that game, whereas Harden put up 26 points on 37% shooting and had quite a lot of ticky-tack fouls go his way (twice as many FTMs than FGMs). Sure Westbrook could've definitely made a better decision on that last possession, but it wasn't like he didn't thoroughly outperform Harden - who had the benefit of balanced scoring throughout the team (yes, it was partly because he was passing more, but the team did generate a lot of production without Harden's direct hand).
Harden's performed pretty poorly against the Thunder this season:
37% shooting performance with six turnovers
26% shooting performance with eight turnovers
25% shooting performance with six turnovers
When they've faced off this season, Westbrook has pretty much made him a footnote in most of those 12 periods, and despite his inconsistent decision making clearly showed why he's the one with a better skillset and more impact.