[x]

You see Black skin and similar poses, and just can't get beyond that. It's not much to go on.

See the umpteen threads here based on Jack Cashill's articles. While Cashill may not be a good source for some things, plenty of people have remarked on the grandfather-grandson resemblance

[Fred Nerks]

So did I, until I collected as many images of Stanley Armour Dunham as I could find, and was able to make comparisons that were NOT based on one image. It's the same story with the Frank Marshall Davis theory, that was based upon a composite created using ONE image of FMD, further investigation shows he was an unattractive, thick-set fellow with a receding chin...and there's no mistaking who HIS son is, it's Mark

And pasting a cigarette into zero's mouth didn't make him look like FMD:

The only thing that zero has in common with Stanley Armour Dunham is a prominent chin, and I have one of those, but that doesn't make me a Dunham.

[Fred Nerks]

There's nothing stopping you from making your own composite images, the originals are all over the web.