What makes a human being great? Is it money? Is it great ideas? Or is it knowing the nuances of the world? The ideal human would have all those things. But they are not what is needed to be great. Greatness doesnt need a barometer. Greatness cannot be measured by all the achievements of a person. It comes from how you choose to live.
Even with all the things he did, fighting crippling illnesses for decades and fighting everyones assumptions for a few more of decades on top of that, he never gave up. He never gave us a reason to doubt his decisions. He did a lot to prove others wrong, but most importantly, he did a lot more to prove himself right.