I honestly don’t have a lot of precedence to back me up here, but the Crew also is known for frugal methods. If you look at Yelich being the richest contract in franchise history, it’s totally possible that Turang could end up exceeding that, if extended in a few years as he nears free agency.
I just don’t know if they are going to be willing to go that far to retain him, especially when they’ll likely have some near MLB ready replacements in the pipeline.
Now, it is possible that they go the Adames route and get all the use out of him as they can before letting him walk rather than dealing him? Yes, absolutely. But if you have Made and/or Pérez knocking down the door in 2 years, it probably makes them consider it.