[Misunderestimated]

If I were voting I would select Donaldson based on the limited stats and remarkable legends. Apart from him i'm not so sure.
I'm old enough that I remember the careers of most of these players (not the Negro League legends or Ken Boyer)

A friend of mine once asked whether it was the "Hall of Fame" or the "Hall of Stats"... obviously these things overlap but just saying whomever (whoever?) has the highest WAR should get in seems wrong. WAR is a very impressive combination of stats but I don't feel it should be dispositive of a player's value for the HOF.
Among other things, WAR doesn't account for post-season performance at all. Even as a lifelong Cub fan I think that's really important, especially if we're thinking of fame and even greatness.

Specifics:
Bobby Grich is one of the strongest "WAR candidates" (he's not on the ballot) but I don't feel like he's a HOFer. On the other hand Tiant, Allen, Parker, and definitely Garvey (whom I loathe) did seem like HOF caliber players during some or all of their careers.