Why was Aizen allowed to become a captain?

[Remodie]

If I'm looking at this right, in the TBTP arc when Aizen revealed he was behind everything to Shinji and Kisuke almost took his head off.

http://www.mangatoshokan.com/read/Bleach/0/-99/22

When everything was said and done why didn't Kisuke or the "Vizards" tell Yamamoto about Aizen and what he had done?

 

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