Nice article that. Amazing the things you can find on the internet... About the chrysaspides. Without reopening that long and drawn-out debate over it, I would just like to say that I believe the existed, not as a separate military unit per se, but just for the military parade at Daphne, they were probably specially created. In other words, I believe they had no separate training whatsoever, but were probably just argyraspidai with shields faced in a different colour for variation, like the chalkaspidai also mentioned. But they were all argyraspidai.

@gran guitarra: What book about Alexander did you read? Title please? I should like to locate in my local libraries if possible and devour it. Before this thread to be sure, I had never heard of the Asthetairoi, not even in my battered copy of JFC Fuller.