I think that the essay is fairly direct in its assessment. If we are looking for a type of reflective note that can be struck, it might that Lennie is not really a character with disabilities. Rather, he represents one part of the human experience. The desire for something more than what is, the hopeful notion of transformation, yields everyone to represent what Lennie does. Certainly, this is true in the story. Candy, Curley's wife, and Crooks are all examples of characters who wish for something more than what is. In each of their conditions, their vulnerability in hope for the future is what makes them like Lennie, holding beyond hope that what can be is able to replace the current state of being. In this development, Steinbeck has rendered a portrait in which individuals who have dreams and live through hope are like Lennie, yearning for change in a world that is stubbornly against it. This is where we resemble Lennie. We cry at the end because when Lennie dies, a part of our hope dies with him. I think that if your paper could develop this type of reflection and construction, there is a good chance that you will be able to leave the reader "thinking" regarding about Lennie and the purpose he serves in the narrative.