The only one who resembles Frank Marshall Davis is his son, Mark:
Just as Mark Ndesandjo is the son of the kenyan student and Ruth Beatrice Baker:
It's patently obvious the comparisons commonly used only work if the same images are trotted out over and over. Once you look at a number of them closely, the theory falls down.
Using black and white images of George - who had two black native kenyan parents just doesn't impress me. George might or might not be a son of the kenyan. And as for the lines under the nose, I think everyone has them.