Interesting observation, but it neglects to consider the players' perspective.
Ngakoue has been trying to hit the open market, and decide his own fate, for years. Instead, he was tagged in Jax, then traded to Minn, then traded again to Baltimore. I'm not surprised he tested the market as soon as he could.
Judon was going to be paid more than he was worth, and the Ravens (and Judon's camp) knew this.
I think it is all more coincidental, than showing any trends that outside rush isn't important. It definitely is.