Caius' death indicates two assassins, just as Sasaki's did. Why all of a sudden this double teaming?

Wishazu's head was taken. Before Sasaki's death, the assassins did not do this. Why now?

Playing with the Wishazu numbers trying to find meaning and looking at the list of those left alive:

18 = 1+8 = 9 = woad&fangs 9th on the list
22 = 2+2 = 4 = Rhyfelwyr 4th on the list
25 = 2+5 = 7 = Chimpyang 7th on the list

Possible ninjas?

I'm not trying to say any of the above has any significance at all. I'm trying to stimulate some thinking. I've no clue and everyone seems to have different opinion on who to lynch.

BTW AggonyDuck, Chimpyang is missing from your analysis.