Because you are right: Oz is a great character who needs more adventures.
And yeah, they can shift whenever they want to, but they also shift automatically three days out of the month and when emotions run high.
There are Lone Wolves in the Mercy universe, who don't belong to any specific pack but do follow the rules (don't eat pedestrians, etc.) Bran oversees them, too, not through pack loyalty so much as through might making right, but he's a good guy. One of other Lone Wolves (Christiansen) is a mercenary who specializes in hostage retrieval and really doesn't get along with other werewolves. I can imagine Oz getting help from Bran and then being introduced to Christiansen as a possible resource for the occasional job in his wanderings. (One of the reasons why Christiansen doesn't like werewolves is that, like Oz, he was confronted by his woman having moved on in his absence and, unlike Oz, there wasn't a Slayer around to stop him.)
Oz and Bran
And yeah, they can shift whenever they want to, but they also shift automatically three days out of the month and when emotions run high.
There are Lone Wolves in the Mercy universe, who don't belong to any specific pack but do follow the rules (don't eat pedestrians, etc.) Bran oversees them, too, not through pack loyalty so much as through might making right, but he's a good guy. One of other Lone Wolves (Christiansen) is a mercenary who specializes in hostage retrieval and really doesn't get along with other werewolves. I can imagine Oz getting help from Bran and then being introduced to Christiansen as a possible resource for the occasional job in his wanderings. (One of the reasons why Christiansen doesn't like werewolves is that, like Oz, he was confronted by his woman having moved on in his absence and, unlike Oz, there wasn't a Slayer around to stop him.)