But in the case of Lawton it can be argued (as it was by crespoblows) that he contributed negatively. Even though the player that the Yankees gave up never made it to the majors, that might be better than the negative contribution that Lawton provided.
I see in a previous post that you, through another forum post, are discussing the Hawkins trade. By your logic, if Hawkins spends any time in the big leagues with the Astros and whoever the Yankees received never does than it is a win for the Yankees (even though you've made the point that Hawkins is horrible). That, to me, doesn't make too much sense.
On top of that, do you honestly think that receiving players such as Sal Fasano, Tim Redding, and Matt Lawton contributes to your theory? As a previous poster has mentioned (I can't find the quote) you can pick up guys that all over the place if you want, either in trade or in the free agent pool. Receiving below average MLB players like that really does not help your argument in my opinion.