Hi Miles,
that ray on the Video from Ivan looks like Orbignyi to me.
And the ray of Brent is in my Opinion an "Dumerilli" too, there u can why I think these are Schroeder/Orbignyi crosses.
The pattern is different to mine because mine is only 8inches.
And u can´t tell exactly on the pattern, because many Dumerilli look different, like hybrids do
But should everybody call his ray like he wants.