I think they killed him to sow confusion, hoping the Ranger would waste a protection on somebody important. The first part obviously worked. I hope the second part didn't.
Now here's what I'm thinking, now that I've napped: Agan is competent: her kind of slip is barely believable. She all but said she's a wolf. Why would she do that when it would be so easy to set up Izzy today? Why put the spotlight on herself?
So I'm thinking: they don't
want to get Izzy killed.
What if Izzy is more important than Aganzir to the pack? I can't see Agan taking one for the team on purpose unless it's for a big win. She was suspected, but not pinned. Why thrust herself into almost certain death?
I think Izzy might be the Big Bad Wolf and the wolves would rather keep their chance at Red Cap alive than keep Aganzir around. Since Agan was already suspected, she would make a good lynch candidate.
They can try to salvage Izzy's mess up at the end of yesterday by deflecting the attention to Agan.
If the village is confident about one wolf and confused about another, wouldn't they assuredly vote for the one?