Firstly: Halsin
Plus he could have gotten out much sooner from the goblin camp, since he seemed to know, that things are not good at the grove. All that makes him look a bit incompetent to be honest.
He doesn't WANT to get out though. Not until the Goblin Leaders have been dealt with. That's literally why he stays there if you free him, he literally says he won't leave until the Goblin Leaders are dead.
His whole "Turn into a bear and get captured" thing was part of his plan. He wanted to be kept there so he'd have time to formulate a plan to take out the leaders. Yes, he could leave at any time (Not only by turning into a mouse, but he also shows he can bust down the door to his cell without issue), but his concern is to protect the grove by removing the goblin threat.
Gortash and plot reveal
If you don't go through the game blindly, you find a lot of notes between Ketheric and Gortash in Moonrise Tower, detailing their whole plan with the Elder Brain.
Aye. I feel it's super strange that I can find all these notes and Ketheric's hidden journal and literally no-one reacts to any of it...
Meanwhile, Lae'zel has reactions to every one of the chronicles of Orpheus and characters react to the note in the Mountain Pass mentioning Wyll's father being taken to Moonrise... So it's not like they don't have reactivity to anything you read. It's just the major plot points that simply get ignored for no reason.
