Out of Character thinking (using In Character Reasoning):
The only reason Orris doesn't want to go with Jach is because Jach's a bit too bossy and Orris hasn't yet found a way to make use of him. Jach is pretty likely to throw us under a bus, at this point, IMO. I'd rather wait for Jach to need us before we help him. His confidence might help him boss his way to getting himself out of here or it might get him in trouble. I'm kind of waiting for the latter. (which, to be fair, could backfire but Jach doesn't exactly seem like a team player anyways)
My goal from the beginning has been to find someone to give us info on what's been happening and who the major players are so I'm inclined to go with Garrik, even for a little bit to learn more. He may be useful in other ways a bit down the road.
Thoughts?
PS:
I'll wait for someone else to post. My next post was going to be "lead the way" but I don't want to hog the narrative.