Thomas, I had exactly the same problem with Haydes, but he broke every single tail feather!
The quilles should still be in place, and will moult out as normal

Haydes now has 2 new tail feathers and has 2 more coming through, He still plays rough, but so far hasn't broken his new ones.
I don't think there is much you can do to prevent Gonzo from playing rough, hopefully that is something he will learn
