If Lawrie can stick at second, it limits his upside as a prospect only in the sense that second base isn't as valuable a defensive position as catcher; however, second base is still a plenty valuable defensive position in its own right, and finding a bat as good as Lawrie's that can hack it at second is a plus. Now, if Lawrie had to move to right field or first base, that would severly limit his upside. As far as "second base prospect" being somewhat of an oxymoron, it's true that many Major League second basemen began as shortstops, because players naturally progress to less-difficult positions as they age, bulk up, and slow down. Oftentimes players who enter professional baseball as second basemen lack the athleticism to play there at a high level, but it's not unheard of, as we should well know with Rickie Weeks. Weeks, like Lawrie, has more than enough athleticism to play second base, but is lacking in fluidity and experience.