This article talks about JJ applying pressure. I saw the Jennings and DDD fights. He doesn't apply anymore pressure than anyone else. At times both fighters were backing HIM up.
https://www.boxing247.com/boxing-news/joyce-vs-j-parker-on-saturday-parker-says-he-will-beat-joyce-twice-and-then-im-free-to-fight-anybody/251433
https://www.boxing247.com/boxing-news/joyce-vs-j-parker-on-saturday-parker-says-he-will-beat-joyce-twice-and-then-im-free-to-fight-anybody/251433