Sometimes when you browse a tag, you realize there were things you failed to post four years ago. Kaitlin and Jean-Luc posted this on one of their social media accounts as a tribute to their elders during a JGP event, and were also responsible for coining a hashtag. :)
I know this kinda goes against what some people think of this relationship, but I think Chris and Leon secretly hate each other and both think the other is incompetent at their work. But they put on airs of being best friends to make their superiors and Claire happy.