1. There is a lot of variability in the lists - ESPN and Fangraphs, BA and MLB have full time people on the job, so the lists all have credibility. The methods differ too, so you get some diversity. (fangraphs and ESPN scout the prospects themselves)
2. Ultimately signability matters in a lot of these choices. Remember, the Sox HAVE to sign their Top 10 picks to claim all of the pool money. I think from the picks it's pretty clear they are going to try to find some bonus money for Keane who they took in Round 11. Faltine in Round 39 I am assuming will honor his Texas commit (he doesn't last to Round 39 if he showed any inclination of signing). You have to assume that the college seniors the Sox took in Rounds 6-10 are there more or less because they will allow them to save pool money for Keane. (Dalton and Scott are probably org guys who will take the $10K bonus happily)