Rezan has no follower in this mini-set because, (unlike the other loa), there are none in WoW we know a lot about, and making King Rastakhan one seems to slightly break the
Old R'gal - NPC - World of Warcraft
World of Warcraft 8.2.0 BFA - Firestorm World Quest Wrath of Rezan - Echoes of Rezan Toy - YouTube