When I say Alliance leader-I mostly mean Varian because he's the only one who would do it-but what do you think? Vol'jin, Baine, Thrall or Lor'themar, etc or Varian, etc with the killing blow?
I ask it in the format I do to see what the general consensus is between which Fraction leader/future fraction leader/race leader deserves to put Garrosh to an end once and for all.
EDIT:
When I was posting this I knew I had left out someone!!! xD Jaina of course is another Alliance candidate for the killing blow.