Just as the title says, I think that Shiki is the 7th Shichibukai. I'm about 20% confident in this as it was just a random thought that popped into my mind but its still possible. Lets reflect on what we know about both men.
What we know about the 7th Shichibukai:
-He's a Level 6 Impel Down escapee
-He cut off Z's arm, an admiral's arm
-Brannew said "the man I talked about earlier" referring to the 7th shichibukai. This is probably a clever hint that the 7th Shichibuaki may be someone we already know about.
What he know about Shiki:
-He's an Impel Down escapee. Someone of his strength would definitely be a level 6 prisoner.
-Shiki definitely has the strength to cut off an admiral's arm and Shiki is a swordsman.
-Shiki was one Roger's strongest rivals and has strength that surpasses Silvers Rayleigh
-Shiki has been laying low for 20 years calculating some secret plan
HOLD IT!!!
Remember, it was never stated that the 7th Shichibukai was one of the level 6 prisoners that escaped during the war of the summit. It was simply said that the 7th Shichibukai was a level 6 prisoner. One more thing, Strong World is NON CANNON!!!!!!!!! Shiki himself is cannon.....
Lastly, take a look at Shiki's attire:
Shiki really looks like a japanese swordsman. A feudal era samurai to be specific. His overcoats kinda looks like Kin'emon's samurai robe. Samurai clothing AND a swordsman? Shiki is from Wano-Kuni anyone? The Wano hype is strong.
Edit: This would be interesting as I made a theory saying that Kuina was actually murdered by a man seeking the Wado Ichimonji and that man was the 7th Shichibukai, who was chased off by Koshiro, the WSS before Mihawk. I believe Shiki was the WSS before Koshiro and that scheme Shiki is planning that will "turn the whole world upside down" is claming all/most of the legendary blades of the world. Its probably just a portion of his plan but its a direct contrast to Tashigi's goal. It'll also be very symbolic for Zoro to defeat another former WSS, much like he did zombie Ryuuma.
What we know about the 7th Shichibukai:
-He's a Level 6 Impel Down escapee
-He cut off Z's arm, an admiral's arm
-Brannew said "the man I talked about earlier" referring to the 7th shichibukai. This is probably a clever hint that the 7th Shichibuaki may be someone we already know about.
What he know about Shiki:
-He's an Impel Down escapee. Someone of his strength would definitely be a level 6 prisoner.
-Shiki definitely has the strength to cut off an admiral's arm and Shiki is a swordsman.
-Shiki was one Roger's strongest rivals and has strength that surpasses Silvers Rayleigh
-Shiki has been laying low for 20 years calculating some secret plan
HOLD IT!!!
Remember, it was never stated that the 7th Shichibukai was one of the level 6 prisoners that escaped during the war of the summit. It was simply said that the 7th Shichibukai was a level 6 prisoner. One more thing, Strong World is NON CANNON!!!!!!!!! Shiki himself is cannon.....
Lastly, take a look at Shiki's attire:
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Shiki really looks like a japanese swordsman. A feudal era samurai to be specific. His overcoats kinda looks like Kin'emon's samurai robe. Samurai clothing AND a swordsman? Shiki is from Wano-Kuni anyone? The Wano hype is strong.
Edit: This would be interesting as I made a theory saying that Kuina was actually murdered by a man seeking the Wado Ichimonji and that man was the 7th Shichibukai, who was chased off by Koshiro, the WSS before Mihawk. I believe Shiki was the WSS before Koshiro and that scheme Shiki is planning that will "turn the whole world upside down" is claming all/most of the legendary blades of the world. Its probably just a portion of his plan but its a direct contrast to Tashigi's goal. It'll also be very symbolic for Zoro to defeat another former WSS, much like he did zombie Ryuuma.