My whole point was that of timeline. Some players are not given enough consistent ABs at the MLB level to mature into a solid MLB player. But I believe that those who crush it at AAA can eventually do just that. For some, though, the timeline just doesn't work. Say, for example, Plouffe has actually figured it out and will continue to be a good/great MLB player for years to come. He just doesn't get several years to work out the kinks on many other MLB teams. My whole theory is that everyone who crushes at AAA can eventually be good/great at MLB, but only a smaller percentage actually gets the time they need to do so. Or, put more succinctly, the notion of a AAAA player is bunk. Given a long enough timeline, all "AAAA" players will eventually bear fruit at the MLB level.