Ichigo in other words will have to pulll a rabbit out of his ass inorder to beat Zaraki, and since this is a "fight to the death"(doesnt matter how weak the other person is(Ichigo) Zaraki will probably kill him. Also I do not believe that Zaraki will let Ichigo leave, or say "hey you're pretty good, lets continue this fight in about five days" and then run away.

@Assertns question: The 5th squad cpt. is Aizen(the guy stuck to the wall), and the vice-captain is Hinamori(the girl in the cell)