King vs Green Bull could have gone either way. In fact I don't see why King couldn't win at full health, I'm actually leaning towards King in a 1 vs 1. He has haxx, flight, decent DF, swordsmanship, hand to hand combat, experience and his magma would 100 % burn through the "flame proof" forest no matter what GB claims. And I'm far from impressed by Green Bull vs injured Beasts, Momonosuke + gang or Shanks.
Queen, Babanuki and the rest could serve as back ups. They'd only be in the way if they tried to fight head on but they could fire at Green Bull from distance providing King with an opening. We've seen Flampe, Mr Go and Gyukimaru show that in an even fight a moments distraction is enough for a fatal strike.