GOKAAAAI... SILVER!
I’m really getting tired of Toei putting important backstory stuff for Kamen Rider shows in Blu-ray exclusive special features, especially since they take ages to get subbed owing to both the Blu-rays taking a while to come out and the fact that they’re always low-priority for getting subbed for groups like Over-Time. They’ve been doing this shit for the past 3 years now (Drive with Type Tokujo, Ghost with Heroic Legend of Alain, and now Ex-Aid with Snipe Episode 0).
This is stuff that should be in the actual series, not freaking supplemental material like Blu-ray exclusive special features. ESPECIALLY regarding Taiga in Ex-Aid, since we’re 21 episodes in and we still barely no anything about the guy and probably won’t learn much until the Blu-rays come out with those exclusive special features.