One of the problems with researching this case is that one's eyes get habituated to certain images, and we stop seeing what's actually in front of us.
Case in point! The
examined-to-death Altgens photograph:

As I've suggested before, it can be helpful to defamiliarize an image by flipping it. Fresh detail------------missed by the jaded eye----------can leap out this way.
Let's try it on Altgens:

What leaps out? Why, the horrible tumor on Mr Lovelady's cheekbone... and chin!
Returning to the original, we now see that it ain't no tumor--it's part of the person standing right behind Mr Lovelady:

Surely the owner of the second head in Wiegman!

And could it be that some of the
dark area everyone has seen as belonging to the head of the gentleman in the tie (in Altgens) is in fact the hair of this person (be it Mr Shelley or Mr Oswald)?