We looked at photographs of Alexei from 1906, 1907, 1908. Bob felt from his height it was probably late 1906, though could also be earlier 1907. His hair isn't curly as in the 1905- early 06 photos, but he is still rather small.
As I have said before, who ELSE would Imperial Court Photographer Karl Bulla take photos of wearing a Standardt cap, exactly like the one Alexei is known to have worn his entire life? We find many facial similarities to the 1907 photos on the Standart I posted above...Bob is a trained portrait painter, trained to see facial similarities. If he is convinced, I'm convinced. He knows more about the IF than anyone else I know.