User blog comment:Tekkphreke/Gotei 13 VS Vandenreich Round 2 Line up/@comment-5657895-20130703043016/@comment-11051098-20130703215713

Yeah, he's not stupid, he would never take the risk of declaring war on Soul Society without thinking it all through. He surely relies on his power, but he is clever enough to have an army on his back.

Aizen thought he alone was strong enough, with the Hogyôku, to defeat everyone, but in the end he lost due to his own arrogance.