17 JUL Update: The Drama Continues...
I've read in my research that sometimes when a highly variegated cutting produces an all white leaf, said leaf may not produce more leaves
I can't verify this but maybe
@gina1960 can help us out!
There's a light green strip at the top of the leaf and a light light green very tiny strip on the new stem (meristem). But it's very faint. If you click and zoom in on the photos it's a bit more visible. I moved the plant to a much shadier location hoping that it might help a tiny bit.
My other guy has been re-trimmed and moved into moss!