User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-3976024-20151101223334/@comment-24834479-20151103015004

1. It was for the seal.

2. There are probably not more branches still active today.

3. The deputy was not truely the Alpha. He was the one that turned the group of them in that town. If you kill one of these monsters, you cure all of the humans they turned.