Do walrus and Yakman have some history I am not aware of? The "it's been so long since I've had a chance to do that" line confuses me.
The "I've been busy" line has defintely been used by normally active players when they become wolves, I have seen it more than once. That said I am not sure about walrus' daily schedule or activity level in previous games.
I think she meant creating a three way tie. Which was the best way to defend Yakman at the time, it's just a question of whether there was intent.
walrus has been coming and going of late, so I'd be more willing to believe her than some of the others. And someone who wasn't following closely, could believably do what she did. But it's still a remarkable enough combination that it stood out to me in one skim of a recap post.