I'm not sure what projections you're using, but the couple I've heard I disagree with pretty strongly. You stated about 3 weeks ago Estrada projected better than Nelson this year in the big leagues, and now Zarraga is a 1.8 catcher? Then there is also the fact that the Rockies have a 25 year old catcher who's put up big numbers the last two seasons .282/.314/.507 with a OPS of .820 and hit 28 and 21 HR's at ages 23 and 24. Given that the Rockies aren't competitive this year, I'm guessing they'd rather stick with the guy with big upside over the guy the same age who's minor league numbers are worse than Rosario's MAJOR league numbers (career .792 OPS for the 25 year old Rosario, .767 career minor league OPS for the 25 year old Zarraga who's played 4 games above AA ). Don't get me wrong, I like Zarraga, and he might be finally realizing his potential, but he's yet to play more than 74 games in a single season, and when you're talking about how bad another team is at a certain position, yet you're suggesting that a guy who's minor league numbers are worse than their current starters major league numbers, I think you're overvaluing him. The Rockies have their catcher of the future and they'll give him more than 60 games in which he hasn't even been that bad to right the ship. They need pitchers who can get ground balls. I think aside from the obvious young arms like Peralta and Nelson, Jungman is a better fit in Colorado than Zarraga. http://www.fangraphs.com/blogs/the-top-10-prospects-currently-by-projected-war-2/ The point isn't Zarraga is a top flight prospect, the point is he is a solid prospect at this point and is blocked in Milwaukee. Holding onto him for a back up is not maximizing his return. He's teh kind of guy who can easily land a spare part to upgrade the Brewers and could be in Colorado right now. The Rays would probably value him much more highly given they know Milwaukee teaches receiving better than anyone else, but finding a match there is difficult unless they take him as a main piece for Zorbrist which I doubt (and Zobrist's market would have to collapse).