This is not even a fair match. You only need Yamamoto
The BEST absolute best that Ichigo can do is beat Yamamoto and that is with the Final Getsuga Tenshou, and that is if he cant dodge it. Also Ichigo has to go Mugetsu to deal with Yamammoto, other wise he doesn't stand a chance. Once he does and decides to use FG Shinji can just use shikai to make him miss. Boom. Then they laugh as Ichigo losses all his powers.
U put Aizen there. He could do that with his shikai as well. Hell he can use his shiakai once Ichigo is in Final Guesuga mode and have him destroyed by Yamamoto with his East/North.