To the previous question as to what would have happened if the real sasori came,
I am sure he would have brought Deidara, knowing how powerful Orochimaru is. Oro and Sasori have worked together for a long time, I bet they would know what kind of tricks and jutsus the other one uses...so if anything, the real match outcome should be weighed as who is the stronger one between kabuto and Deidara. And for my opinion, Deidara should be able to overpower Kabuto.
Also, I had no idea to think that Sasori might be interested in Orochimaru's body transfer jutsu. Because Sasori uses human puppets for bodies anyway so I really don't see why he would need one. I thought that he just planted a spy in there to find out Orochimaru's plans or location but I guess finding out such an important jutsu like that is plausible.