Lurgan
Bloodbeak the Ravenous
Groffnar
Stormcaller Narkena
Huntmaster Yrgena

They mostly have shared appearances I think, but they're still missing.

That was fast! I can try to get their completed quest IDs if you need?

Lurgan: https://www.wowhead.com/quest=74464/lurgan
Bloodbeak the Ravenous: https://www.wowhead.com/quest=74467/bloodbeak-the-ravenous
Groffnar: https://www.wowhead.com/quest=74463/groffnar
Stormcaller Narkena: https://www.wowhead.com/quest=74465/stormcaller-narkena
Huntmaster Yrgena: https://www.wowhead.com/quest=74466/huntmaster-yrgena