Maddo_scientisto said:
It was never said that the spirit king is linked to everyone, of course it is definitively a possibility to consider but I wouldn't go so far as to call it a fact.
Maddo_scientisto said:
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Like I said if zeroth squad has the ability to fuse with their sword (which was shown that shinigami can with the help of the FGT shortcut and zeroth squad should obviously be at the upmost limit of shinigamis) then Ichigo, Aizen and Ginjou wouldn't be enough, still it should be possible that some other character join this group.
Sounds like you use your ideas as facts though. Fai's theory works way better than just sticking powers that haven't even been showed yet to characters that we haven't seen yet.
No one seems to know anything about the zero squad beside maybe Yamamoto. So either it doesn't exists or like someone said earlier, they're "stuck" in the Soul's king dimension or such.
Because seriously, the gotei 13 never had an enemy strong enough to even feel like they needed to train like they did post-aizen. Why would they have a top-secret squad that is about several several time stronger then the 13 squads....
Any enemy that would require the zero squad to be dealt withy would wipe the floor with any of the 13 captains.