Brian, I agree with aspects of your point but you keep going back to the shortstop argument... but it's a terrible example to use for positional flexibility. Prospects are kept at short and centerfield as long as possible because they're far more valuable at those positions than anywhere else on the field. It's a matter of attrition. Play short at every level until you prove you cannot play short. Play center at every level until you prove you cannot play center. Dozier and Plouffe, two of your primary examples, are very good case studies why this happens. If either one sticks at short, they are immensely more valuable than they are at second or third. In their respective cases, the front office determined that Dozier had range but no arm. That forced a move to second base and he did well. On the other hand, Plouffe had no range but a cannon. The front office moved him to third as a result and he did pretty well for a couple of years. I'm all for positional flexibility and Rosario is probably a pretty good example of how that can be exploited to a team's benefit. But those players are pretty rare, I think... you don't make those players, you draft them and even then, you're going to fail a lot of the time. If a player can't stick at short, he can't stick at short. That's the end of the discussion. But that doesn't mean you're going to find a particularly valuable place to put that player, it likely means you have to slide downhill to a lesser position and the net gain is little or nothing.