Reading @TheKnightOfTheSea 's post about possibility of both of them being connected to Wano have me thinking. Probably what happened between Shiryu and Fujitora is similar to what happened between Blackbeard and Whitebeard.
Both Blackbeard and Whitebeard belonged in same crew.
Both Shiryu and Fujitora belonged in same dojo or samurai army in Wano country.
Blackbeard killed Thatch to get Yami Yami, then ran away from the crew.
Shiryu killed the whole dojo in sadistic way (he was locked in Impel Down for similar reason) bar Fujitora who was away, to get Raiu, then ran away from Wano country.
Fujitora came back and saw what happened to his comrades (and the sad condition of their dead bodies) then blinded himself.
Maybe stretch but the reason Fujitora wanted to disband Shichibukai was related to this. He doesn't want evil person working for Government, like Shiryu who was working in Impel Down. Teach, Shiryu's current boss was also part of Shichibukai.
For ending, we know the end result to what happened to Whitebeard and Blackbeard at Marineford.
But in case Oda reading this and changes what's already in his mind for sake of being unpredictable, I will stop here.
Thoughts?
@Sentinel @Tyki_Mikk @ZenZu @Nidai_Kitetsu @SakazOuki @Lee Ba Shou @nik87 @L57 @TheAncientCenturion @Buusatan94 @Xione etc.
Both Blackbeard and Whitebeard belonged in same crew.
Both Shiryu and Fujitora belonged in same dojo or samurai army in Wano country.
Blackbeard killed Thatch to get Yami Yami, then ran away from the crew.
Shiryu killed the whole dojo in sadistic way (he was locked in Impel Down for similar reason) bar Fujitora who was away, to get Raiu, then ran away from Wano country.
Fujitora came back and saw what happened to his comrades (and the sad condition of their dead bodies) then blinded himself.

Maybe stretch but the reason Fujitora wanted to disband Shichibukai was related to this. He doesn't want evil person working for Government, like Shiryu who was working in Impel Down. Teach, Shiryu's current boss was also part of Shichibukai.
For ending, we know the end result to what happened to Whitebeard and Blackbeard at Marineford.
But in case Oda reading this and changes what's already in his mind for sake of being unpredictable, I will stop here.
Thoughts?
@Sentinel @Tyki_Mikk @ZenZu @Nidai_Kitetsu @SakazOuki @Lee Ba Shou @nik87 @L57 @TheAncientCenturion @Buusatan94 @Xione etc.