If only Rhyland did not exist.
It was easy to hate the man.
For one thing, Rhyland was a smelly dog; his kind has always targeted theirs, the vampires. And for another, he stole Miles J Wentworth's woman.
Wentworth was planning to take revenge on the werewolves who murdered his family anyways
As such, Wentworth just as easily was able to include the man in his revenge plans. It was just that Rhyland who had manifested as a true alpha was so much more harder to kill.
He knew he can't rely on Cross to get this job done. Despite having Ava in his grasp he knew Cross does not have the ability to defeat Rhyland. This was a job he would have to do himself. And he didn't mind it in the least. Wentworth wanted nothing more than to twist the neck of that son of a bitch. It was all because of Rhyland that Wentworth turned out this way. Because of Rhyland, Wentworth had to take the serum that was not in its final form.