Yes he correct that there are different ways people calculate Wins Above Replacement. The two main versions of WAR (Fangraphs and Baseball-Reference) use different statistics to calculate different portions of WAR. FGs uses Fielding Independent Pitching (FIP) for pitching, and BR uses Runs Allowed. On defense FGs uses Ultimate Zone Rating (UZR) and Baseball Reference uses Total Zone. UZR is the more accurate defensive statistic but only goes back to 2002. (FG uses Total Zone for seasons prior to 2002). And then baserunning FG uses Ultimate Base Running (UBR) some other weighted system. I personally just stick to Fangraphs.
btw, if you just look at the statistic wRC+ (think of it as a weighted version and park adjusted version of OPS) you can tell trout is the better player.
Trout 171 wRC+
Cabrera 164 wRC+
the positional adjustment for 3B and CF are about the same, but I think its pretty clear which is the better defender and then of course the better baserunner.
Its really a no-brainer on who should be the MVP. Trout should be unanimous.
