I had no idea peace was possible no matter the choice. My thought process was: save the spy, say yes to the lizards but help Thane instead, then bomb the village. Which means i've helped Thane twice, however the option to invite him hasn't shown up. I just wanted to play through the version where Thane returns to the tavern instead of the bull village.
Viewing post in CW:Spoiler;Need help with Thane after part 3 of the war
Just did some testing, it seems not helping Thane in part 3 prevents him from offering to move there, not that it matters, he is coming over in the neutral route regardless, but i am gonna add the detail to the guide.
Edit: it was actually already specified in the guide, but i made it more clear in various parts.