In my mind Kakashi and Oro meet up regularly to discuss their very non-human aspects, and to compare notes
They have, multiple times, busted down eachothers' door's to ask questions
Whenever something doesn't overlap in their experiences, they have to bring in Jiraiya and Tsunade to help them figure out if its a normal human thing, or if its specific to their weird brands of kinda-human
That's actually a really cute thought, that then becomes infinitely hilarious when u realize that there is a VERY limited timeframe in which Kakashi could do this before Orochimaru becomes a war criminal defector and Tsunade runs away. So in this scenario, Kakashi is either:
1, like. a toddler to teenager. Just busting down Orochimaru's door going "hello I have more biology questions for you" (especially funny for me to picture as a toddler tbh)
2, regularly leaving Konoha to go talk shop with the terrorist who killed/is plotting to kill his Hokage