User blog comment:Kogath/Monster Hunter Generations Ultimate Discussion/@comment-6050823-20170224163954/@comment-20010297-20170224191531

@HunterMortox, Molten Tigrex and Lucent Narga are Rare Species, like Gold and Silver Rath, so there's a slight chance of them.

Also, Raging Brachy is just a Variant, like Savage Jho or Furious Rajang, so there's a better chance of him returning, and I really feel like he might.