Sorry, but I don't see this as a "Jerry move", but instead a compromise between he and Garrett.
Jerry and Stephen wanted Linehan gone, while Garrett didn't. That's evident. When he was fired - yes fired - they had internal discussions over a replacement and new structure. Garrett got the staff he wanted, and in exchange, the Jones will not extend his deal unless there are results.
In other words, "we'll let you handle 2019 your way, but if it doesn't work, you and everybody else are out."
Think about the fact that within minutes of the new staff being unceremoniously "announced", word also came out that Garrett would not be extended. That's not mere coincidence. That's getting the word out, this was a compromise.