I think you are right, but I think to really appreciate Stearns' strategy you need to look at everything. They seem to have identified some definite characteristics in pitching prospects that signal dominant relievers, but maybe marginal starters. So in part they created a healthy part of the pen depth from internal prospects. At the same time recognizing that the free agent value for starters just isn't there, and you are better off making aggressive use of a truly deep pen to mask mid rotation starters. You still need a deep enough group of starters to cycle through guys with injury or performance issues. Finally I think a recognition that the prospect to player value is out of whack in certain cases means you can look at trading modest prospects for targeted bullpen depth (since bullpen guys are so volatile) to keep the strategy working over the course of a season.