I feel there should be an option to free up a guild slot on our side.
since its an alliance I believe an UI for guild to be merge into and select as a whole team is better rather than all
have to join under a guild. Maybe the guild leaders that agreed to form an alliance can form into a squad or party
to register with the NPC in charge, then all guild members will then just have to select ur own guild to be in the same
alliance ... so many years into the game, its like forcing ppl to give up many years of friendship in that one guild just cos of alliance