Have the LIs (aside from Caleb and Zayne) met each other before

Zayne’s involvement in Homecoming Wings got me wondering: I’m sure he and Caleb have since they both grew up with MC. Are we sure it was Caleb who was with Rafayel in the dark car at the end of the first story arch? If so, they’ve met. Is it possible Rafayel knows Xavier (or at least Lumiere) since he goes to The Nest which is in the No-Hunt Zone where Xavier goes? He had to at least have seen the wanted signs for Lumiere at The Nest. What about Rafayel and Zayne? Zayne and Xavier? Caleb and Xavier?