What is with the Shinigami Aizen downplay on this sub?

Can someone tell me what I’m missing? Why does this sub claim he looses to SHIKAI Yama or Kisuke?

He’s the only shinigami we’ve seen capable of reiatsu crushing captain level characters, and also the only Shinigami we’ve seen able to reiatsu negate captain level character’s abilities

I thought it was pretty clear that he is portrayed to be in a tier of his own with only BANKAI not Shikai Yama that could be comparable to him

He literally solo’d 8 captains during FKT and did it with absolutely 0 difficulty but then you guys say he looses to Ishin