Kollen sometimes can't be trusted. He is very dishonest and lies a lot.
It sure is a miracle for him to be in this pack, Jack sees potential in him, that's why he let him join.
Kollen is a fast learner, he reads a lot and he is an amazing hunter, he is in fact the second hunt leader which is amazing!
He never disappointed Jack, well, yet if he tries something bad, Jack is clever and he will outsmart him so no worries.
Kollen had no family and no pack. He was an orphan but he grew up in a strong wild wolf.
He may not be perfect to anyone, but to Jack he is like a brother.
Hunter 
Hunter