We've seen it takes dealing about 7 good prospects to go from ranked 3 to ranked 30th. So the difference isn't so large.
But the thing is, 4 of those 7 have already made the majors. The real question is, how many actual major leagers do the Sox have i their farm right now? And I'm not talkiing about Bobby Poyner types who do pitch in the majors, but are really more AAAA variety shuttle bus candidates. I mean players who will have an actual MLB career.
You can guesstimate a bit by looking at rankings, but bear in mind that on every BA Top 100 list, there are about 30 players who won't play in MLB beyond maybe a September call up.
Even guys like Casas. He's the top ranked guy, but he also plays the toughest position to crack an MLB lineup, since there are plenty of 1B out there who can hit, but couldn't field their minor league position.
I realize it's next to impossible to speculate on A-ball guys. But if you look at Pawtucket and Portland, how many actual future MLB players are on those teams right now?