You can maybe add Yellowflash to that list too. Not for Knoxville or Road Rage, but it's the same time period.
Yellowflash swears up and down Nick and Kayla wanted to have a threesome with Gothic Sushi, circa 2019.
Could it have happened? Sure. Is there much evidence beyond their word? Not really.
However it is interesting to how Nick was really adamant that GS meet his wife, when he talked to her on his show. It seemed innocent enough at the time, but that takes on a whole other dimension with what we know now.
I can't shake the feeling the two of them have been doing, or trying to do, this crap for a long time now, but used to hide it better. I don't believe for a second that everything was relatively normal in their marriage until "Star Trek Ian" showed up. There's too many other things.