The one time we see Shisui's Susanoo, it has a glowing red tomoe in its chest.
Given that the other two Imperial Treasures of Japan are in Naruto (Itachi's Susanoo had the Yata Mirror and the Totsuka Sword [which has some parallels/connections with the story of how the Kusanagi sword came to be in Shinto mythology], and Orochimaru had the Kusanagi sword), does anyone think perhaps this was supposed to be the Yasakani jewel?
I'm guessing Kishimoto had plans for Shisui to be more involved in the overall Naruto story and get more screentime and "pagetime", which would eventually lead to it being stated that the red tomoe in its chest was in fact the Yasakani jewel, and perhaps something about a mission Itachi and Shisui went on to recover the Imperial Treasures and they ended up giving them to their Susanoos or something. Thoughts?