Ok, I have both these quests at the moment. I took Glut with me, defeated the Dwarves, talked to him, and took his Avenge quest. At some point, I went into an area with Kua Toa at which point, Glut just disappeared from my party. I guess he went back to the Colony.
I have since rescued the mushroom hunter and finished the Ruined Tower. Whenever I get back to the Myconid Colony, they invariably enter Combat with me at which point I see Glut is there and battling them. I was able to go in Stealth first to talk with Omellum and get that Ring and fast traveled out. However, I would like to complete the Mushroom Hunter quest but those NPCs are both aggroed on Glut. If I sit out and wait, they kill Glut. The Avenge the Sovereign quest ends with him dead, yet they all still aggro on me.
Is my game just screwed at this point? I had hoped to complete the Protect the Myconid Circle and just either abandon Glut's quest or come back later.