When we are having a discussion, it's important that the arguments presented are logical and based on concrete facts. If there is no clear connection between the premises and the conclusion, the argument will not be valid. Therefore, it's essential that you provide relevant evidence to support your point of view and, thus, arrive at a coherent and well-founded conclusion. Otherwise, there will be no basis to continue the discussion in a productive manner, and I will simply have to label you as nothing more than a TROLL.
It's your assumption to think that way, however, I have already done my part by posting the evidence clearly demonstrating that Yamato was constantly being prevented from performing any function in that fight, and the same applies to the other retainers. You don't need to be a literary genius to understand this simple fact. Whether Yamato can or cannot defeat Green Bull is a supposition, but due to the fact that Yamato was ordered not once or twice but three times not to interfere in the confrontation, it makes me think that she would have caused serious consequences to Green Bull even if exhausted from fighting in the Onigashima war.
And at a certain point, Green Bull began to feel ashamed of being beaten by an 8-year-old boy who was discovering how to use his powers. According to the admiral, he was in a lot of pain just from receiving attacks from a child.