Aizen was hit by all 5 Bala and the Cero. However his boy disappeared and appeared behind kosshi and Kayla. They both got slashes across the chest (Remember we aren't Arrancars yet, we're still just Hollows)
Aizen spoke "My Zanpaktou, Kyoka Suigetsu has the power of complete hypnosis. Its futile to try and attack me."
Reaper appeared in front of him. He growled "Who are you, Soul Reaper?"
Aizen simply smiled and held out a blue crystal. "I will tell you, but first I want you to touch this."
Repear held out his hand and grabbed it. He suddenly cried out in rage. His Hollow Mask was cracking, his black wings and claws were receding. A big cloud of dust appeared.
Out of the dust cloud came a creature that didn't look at all like Reaper, it was a human. But....he had a zanpaktou, white robes and part of his Hollow mask was still on him.
Aizen siled "Success"