Board Thread:Questions and Answers/@comment-10797017-20130627100621/@comment-11051098-20131009145343

N-e-ls wrote: Yhwach may say whatever he wants but the first invasion was done only in order to kill Yamamoto.

@K3npachi: I believe he regards them as a joke "Mere humans believe that they can recruit me... how cute".

I agree. The first invasion was the one that came totally out of the blue, despite the war declaration. Yamamoto was the strongest Shinigami, they needed to kill him as soon as possible.

And I agree on Aizen's view - he discarded Ichigo as a "mere human" even though his soul form is a Shinigami, so I doubt he views the Quincies any different.