So, the picture is from a museum in Florence, Italy. It is interesting for me because if I saw a student doing this variation of Sankyo, I would correct them for doing it "wrong." I can expand my understanding of what Sankyo can be with this example, and that gives me some freedom.
On the other hand, no one is saying O Sensei lived 2000 years ago, or that he ever saw Rome, or that he enjoyed public nude wrestling. There is no saying Roman soldiers taught Japanese martial artists. There is no reason to see two similar ideas and force a direct correlation.