Actually, the whole idea of regression to the mean is that you should assume regression. Of course, some prospects do really exceed their perceived expected potential, and Escobar, Santana, and Schafer will hopefully be some of them. But unless he drops his strikeouts dramatically, Santana in particular is not likely to maintain his current production, at least from an Avg. perspective (I could believe that he improves his walk rate though), because his BABIP is a ridiculously unsustainable .405. This article explains how incredibly hard (or really, impossible) that is to maintain, even for someone as fast and line-drive prone as Santana: http://fantasyalbatross.com/2015/01/15/beware-of-danny-santana-babip-regression/ That being said, Santana is a great asset to have, and could turn into a very solid player, especially if he can stick at short defensively, which all reports suggest he has the potential to do.