1. kabuto's eyes turning red didn't mean that he has special eye jutsus like sharingan. it was just for the foreshadowing effect that he's stronger than he seemed during the forest of death.
2. kabuto can't be an akatsuki member because orochimaru would know about it (not like it would be any problem though). kabuto would be on a mission to capture all things related to jutsus and he isn't. instead, he is aiding orochimaru.
3. kabuto is lame so therefore, kabuto turning out to be the akatsuki leader would be lame.