I think that your speech might want to include much in the way of collective vision. The use of "we" and other plural pronouns is going to be much reduced because Boxer rarely speaks of self. Boxer is one of the purest characters in the novel. His sense of sacrifice is not something that can be overlooked. When he would articulate the state of affairs on the farm, he would stress how wonderful things are now that the animals are in control of the farm. He would stress how great it is to work for "Comrade Napoleon," and how, like him, all animals have to commit to "working harder." As he struggled mightily to build the windmill, Boxer would make impassioned pleas for all animals to do the same. He might even make the argument that because the farm is under animal control, there is a moral or ethical obligation to work more diligently than if the farm were under human control. The most challenging element in this speech is to depict Boxer not as a skeptic, nor as someone who will lead a counterrevolution. Boxer's sense of loyalty and character make him ideal for stressing the positive state of affairs on the farm and also make him ideal for being manipulated by Napoleon. I would think that this condition has to be conveyed in the speech.