It is extremely difficult to build a solid, let alone great, pitching staff in MLB. Losing that many years of Gallardo would hurt, but then again as HiAndTight points out, that is precisely why trading Gallardo would bring us back players of value. In a lot of ways, it is a great idea in theory, however in reality there are a few perhaps insurmountable challenges: 1) We have a GM who sincerely believes that you can build a World Series team with the likes of Yuni B as a starting SS! In other words he feels he can "cut corners" in building a team. And further compounding the problem: he was almost proven right!!!! Because of this, Melvin likely feels that he is just a player or two away from striking Gold again... 2) Keeping Gallardo, and re-signing Greinke or spending the Greinke money on another impact player will make Melvin feel like they are just a player or two away. 3) Ken Rosenthal recently reported that the Brewers do not want to do a complete rebuild, that they feel they are (here it comes again) "just a player or two away from contending again", so if the Brewers deal Greinke it would likely be for "major league ready pitching". (which, honestly, didn't make a lot of sense to me, i.e. why would a contending team trade away MLB ready pitching in a pennant race?)