Non-enshrined top Twins players by WAR*:
Chuck Knoblauch, 38.0; Johan Santana, 36.1; Roy Smalley, 23.7
Note also a number of Senators: Walter Johnson, 167.8 (!); Sam Rice, 53.8; Joe Judge, 47.8; Goose Goslin, 43.5; Buddy Meyer, 42.4; Clyde Milan, 40.1; Joe Cronin, 37.0; Cecil Travis, 30.5; Buddy Lewis, 29.4; Ossie Bluege, 28.7
Given that he asked to be traded, Knoblauch is unlikely to get a plaque. Since he earned two Cy Young awards during his time with the club, we can be certain that Santana's time will come. Johnson and Goslin ought to at least get a display somewhere on the concourse.
* WAR earned while with the ball club, not career WAR