>>537797921
Correct. The entire plan was Durge's from the start. Durge stole the crown from the vault in Hell and presented the idea for this plan to Gort and Orin. So the brain adores how devious you are and goes along with your plan because it likes it, and because it does create lots of mindflayers which is ultimately the brain's long term plan too so your goals align. The Netherbrain is sapient and has a personality, and it chooses to help Durge out of respect for his gumption.