Why talion

I don’t understand why talion didn’t make bruz overlord honestly bruz would probably stay as his follower if he was the overlord I understand what ratbag said about bruz not being overlord but most likely when you capture the fort he is the strongest follower heck I hated bruz and he still did not need to be deranged, I know there is a reason but it would’ve worked if you made him the overlord and just not made an entire annoying quest line, you guys can give your ideas about what could happen after or just tell why it should’ve happened