What is the exact reason awan thinks he's Zack?

well if anda watch advent children complete the white light is there and zack is standing behind him and awan says "i am your living legacy" then he defeats sephiroth

awan thinks hes zack because of sephiroths mind games through the jenova cells thts best i can explain it

anda need to play Crisis Core to understand that...after awan defeated Sephiroth..he and zack woke up in a laboratory where dr.Mojo planted Sephirots sells to zack and awan and made a new Project...it's kinda weird but u need to play crisis core to understand...anyway excelent game...the whole FINAL fantasi 7 :D

*smiles innocently* I have no idea... >:)