People always give Greb **** for those training clips, but I’ve now seen a couple other fighters from that era that “shadow boxed” pretty much the exact same way. Johnny Kilbane was another and that didn’t reflect on how he boxed in the ring one bit. Seems to have been more of a workout or warmup. Not really sure what use it was, truth be told, but I know now it definitely wasn’t exclusive to him and likely didn’t reflect on what he actually looked like in the ring.