Yeah it's no mystery that a guy like Revere actually helps your offense quite a bit.
Drury is basically a top 100 fantasy prospect. 55 hit + 55 power for an infielder in Arizona is pretty attractive. He hit .302, .299, and .303 the last three years in the minors and had a .200 ISO in 2014 and 2013...
De La Rosa is similarly interesting as a MLB roster "prospect". 13th hardest FB in the majors last year for starters, gets swinging strikes, and has standout offspeed pitches.
Hammel is pretty underrated, I guess. Sometimes Coors Field can leave a stink on a guy. Now that he's in Chicago the package is very attractive. Not unlike the STL version of John Lackey, who people seem to appreciate.