The Ancient Ape Demons comprised many branches that included the Crimson Gorillas, the Extreme Spiritual Divine Monkeys, the Six-Horned Divine Monkeys, the Nine Netherworld Ghost Monkeys and the Heavenly Demons Apes, etc.
The branches were not all on friendly terms. For instance, the Nine Netherworld Ghost Monkeys were at odds with the Crimson Gorilla Ape Demons.
When Lin Feng and Shi Tianhao encountered the Crimson Gorilla Grand Sage during their expedition into the Barren Expanses years ago, the Crimson Gorilla Grand Sage was already aware that Shi Tianhao murdered some disciples of the Six-Horned Grand Sage but he wasn’t too hostile about the fact.
However, the Heavenly Grandmaster Grand Sage had no choice as he was the tribe leader of the entire race of Ancient Ape Demons, and he had to seek justice for his entire race.