For a Ted Williams franchise/elite player, Sox Prospects would have a player noted as an 8. They currently have zero players with an 8 as a scale.
For an AS level player, Sox Prospects would have a player noted as a 7. They only have 3 players noted as having a ceiling of an AS: Devers, Groome and Flores.
Seems reasonable enough to me.
For Sam Travis, they have him currently at a 5, with a 4-6 range. That means they seem him as being able to contribute as an average starter in MLB with the potential maybe of someday making an AS team, but not regularly.
That seems reasonable too.