Wolf will be possessed! Because a person already traumatized by having eaten people obviously needs to eat more people. He was raised as a human so he will be easily possessed. He'll go back to not eating at all again after this.

Jinbee and Vaiz won't be possessed though. Jinbee will help protecting people and Vaiz will only fight if he absolutely have to but I'm also up for mercy killings. Or being killed and eaten, for that matter.