Baseball reference states
We present the WAR values with decimal places because this relates the WAR value back to the runs contributed (as one win is about ten runs), but you should not take any full-season difference between two players of less than one to two wins to be definitive (especially when the defensive metrics are included).
Fangraphs states
WAR is not meant to be a perfectly precise indicator of a player’s contribution, but rather an estimate of their value to date. Given the imperfections of some of the available data and the assumptions made to calculate other components, WAR works best as an approximation.
If used as designed it doesn't matter which version you use.
About all you can say for what the Twins signed is that some were solid starters, some were better than nothing. It really doesn't say anything about the FO's ability to judge talent. The careers of Ober or any other talent the FO signs or drafts is what will determine their ability