Agreed, give me the stars. A single 6 win player is more valuable than a pair of 3 win players because all MLB teams should be able to add a player that produces more than 0 WAR to take up the free roster spot, thus producing more wins overall.
There is certainly some kind of "WAR concentration value", but I haven't seen any work done on quantifying it.
Yet another point in favor of drafting BPA rather than a grab bag of "signable" guys.
More goes into it then just the WAR. If those two players are making 15 cumulatively while the 6 war player is making 30 then I'd rather have the 2 3 war players. This is less relevant to a team like the Yankees though