Interesting idea but...
As I started the book it was quite refreshing from the usual werewolf stories, the MC being a homeless human, but as I went on reading everything just kind of mixed up and felt rushed.
Read the story now
For example, change of scenes are not very well "visible" and sometimes things aren't very realistic (speaking in supernatural terms) like the female MC discovering that werewolves exist and suddenly knowing about mates but not being curious to know more or the battle against the vampires, where they were portrayed as weak and more than clumsy.
Sometimes things just happen so fast that you didn't really have time to adjust.
Furthermore the emotions of the characters didn't feel very rich, as in the anger, resentment felt, were portrayed in a more simplistic and almost poor way. It didn't feel like they were adults/wewolves.
Also, the male MC was the hero of the day more than once but nothing hinted he could be near the scene of the attack, he just jumped in the scene from nowhere; it felt kind of forced, especially because of his feelings towards his brother and the fact that he wasn't even on pack's land. (Did they mind link him? Wasn't he avoiding the pack?)
I'd say that the idea behind this book is quite original and maybe with a bit of changes in the pace of the story and a more realistic portray of the characters, it would be an enjoyable and interesring read.