Ichigo>>>>>>>>>>>>>>>>>>>>Aizen, Aizen couldn't do anything vs Yhwach, KS is pretty strong but with that one we are talking matchups.

Hashtag is too featless to be on this list and the only reason to even mention him is because he was Yhwach's "successor", but a) clearly no one would ever be Yhwach's successor and b) Ichida took over his place and if you solely use this statement for scaling, then Uryuu>Hashtag, which obviously makes no sense.

Yamamoto barely scales to any high tier, really. Gerard and Lille are both >>>>>>>>>.

Pernida and Shunsui are rather surprising, most people would raise Kenpachi, Askin or Gremmy, who's not on this list for some reason.

Yhwach>>>>>>>>>IchigoAizen>~Ichibei>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Gerard/Lille(/Gremmy) (most people agree that Gerard's ability is stronger)>>>>>>>>>>>>>>>>>>Bleach.

Unironically you could make an argument for Mayuri to be top tier, as he basically carried the entire war, was the only one to not fall for Askin's traps and performed exceptionally against a god tier character, though he only won due to some bs.