That is silly - but the WAR leaders is a good place to start. WAR is not precise enough to take as gospel, especially with smaller margins.
As such, Betts and Trout are far and away the best choices for the award. Ramirez, Lindor, Bregman and Chapman are clearly a step down but worthy of consideration, and in many other seasons WOULD be serious MVP candidates. JD Martinez I'd put up there too - while the fact he added no defensive value is a fair minus for him ... I mitigate that somewhat by noting that his job was to hit the baseball and he was elite there.
Betts is a fairly easy choice in that the narrative and the numbers match. But Trout is certainly deserving. Betts' edges in WAR come from defense - but a lot of THAT edge comes from playing RF where the baseline performance is lower. Would that edge hold up if Trout played RF and Betts played CF. There is reason to believe they are basically tied.
The problem with talking about team success is that in reality you are evaluating the other 24 player on the roster - when you are supposed to be evaluating the player.