The black concept oppose to Amiya white art, the red dot iris, her manner in this, those and 2nd arc's trailer.
Yeah, it definitely refer to the theory Theresa possess Amiya.
Yes — 11 November is Pocky Day for the same reason as it is Bean Sprout Day; you line up four of each and it's 11-11. You're probably more likely to hear about Pocky Day online, and Bean Sprout Day at your local market, so.