WW XXIX Dor-en-Gaur

[Rikae]

The stronger wolf can take down a kill on his own, while the weaker two have to work together. If the strong one is killed first, then the weaker two still have to work together, and if a "weaker one is killed, then the remaining weak one has to hunt with the stronger one because s/he can't do it alone. In actual gameplay, it doesn't matter which wolf is which.

That sounds like a plausible explanation. If that was the case, killing the lead wolf and one of the weaker ones would mean maybe the last wolf couldn't kill - now that's hopeful.