I think if you take the MVP literally and look at the player most valuable to his team, in the entire league, its very hard to argue that Watt is that guy.
Is Watt the most dominate player at his position in the league? Yeah, probably, good argument for Murray at RB as well, but that isn't what the MVP is. Thats why there is the MVP, OPOY and DPOY awards. Watt is certainly the DPOY.
If the MVP was given to the player who had the best year in relation to other people at his position, regardless of the impact that had on the game, you could give it to a punter or a long snapper or something, again that simply isn't judging criteria for the award.
Very simple question: Is Watt more valuable to the Texans than Rodgers is to the Packers?