Plus it all depends on contract. An average player making $20M is horrible value. Verdugo makes $3.55M and is arb-eligible for the next two years. Average production at low salary = value.I think average-or-very-slightly-above is about right. In that sense he's expendable at the right time. But two caveats. It's Ok to have an average player at a position or two. It sure beats bottom 10%. Also, it appears from the outside that he plays hard no matter the circumstances, which is pretty handy to have around during, for example, a season-starting team slump. (tl;dr --- "good clubhouse guy," which has some value, however unquantifiable it is; and assuming he is one).
It's kind of the equivalent of Bronson Arroyo back in the 2004 range. He was a slightly above average pitcher for the Sox (109 ERA+ in 2004-2005), but he threw a lot of innings and didn't make much money, so he had a ton of value.
Edit: and less this be misconstrued that the Sox are trying to win the "value" game... I'm not suggesting that is their goal. By having guys with average production at a low cost on the roster like Verdugo, it (hopefully) allows them to pay guys like X and Devers longer term.