The values they have for Barnes and Benintendi are updated, based on the number of years remaining on the table. Of course, both could change depending on what the players actually receive in arbitration.
As for me, Barnes is the clear outlier. He is a good pitcher, but his true value is diminished by the fact that he can't seem to pitch effectively on back-to-back days. That's a big deal for a high leverage reliever. If the Sox can find a team willing to take him on at anything close to that calculated value, they should do it and move on.
Using the values on that sight (which cannot take certain factors into account, like whether or not the other GM actually wants a player), the Sox should be able to trade Barnes straight up to the Dodgers for rookie RHSP Tony Gonsolin. If the Dodgers, who are annually looking for a reliever to help Jansen, would make this trade, the Sox should do it and not look back...