Harlan, Chin Na is actually part of most chuan fa styles and is prevalent in crane systems. Since Goju's ancestry includes crane, it is only reasonable to see many chin na moves throughout goju. I have a feeling you already know this, but the newbie that posted the first question may not.
Many years ago, before I had looked into chin na, I used to say Goju had "ju jitsu like techniques". Then I found the joint locks, takedowns and throws were from something that predated ju jitsu and got my facts straight.
If you look into chin na from crane and tiger systems, you'll see many moves right out of different goju kata.
One comment on cxt's post- you can have hard kime AND still move in a flowing manner. There is no doubt watching may Sensei and some other senior practitioners you can have both.