Mackey's story is fine. He's doing the exact thing the writers often do at Twins Daily-typing up a short article to get a discussion going. Not every story here is a manuscript length dissertation with sources (thank god for that ). For example, he points out
"Additionally, Adams, Carpenter, Rosenthal, Garcia and Craig were all drafted in the 8th round or later - rounds where teams are essentially throwing darts, blindfolded. The Cardinals are finding gems in these rounds."
That's more than blind luck. That's not even half luck. The point is, the Twins are throwing darts blindfolded, and the Cardinals are not. The Cardinals apparently know certain traits to look for. These might not even be baseball traits. Or maybe the Cards see something once these guys get to their assignments and they get immediate priority, regardless of where they were drafted. Whatever the Twins have been doing hasn't been working. I think that's Mackey's message/reminder of the day.