I have been thinking over a theory that Kabuto is actualy not loyal to Oro , instead he wants to kill him and i think Orochimaru also knows that in some way. If you remember Kabuto is not originally from Konoha....he was brought back from a battlefield by a field doctor. and Kabuto was actually a child of the enemy. And i think Kabuto's parents were killed by Orochimaru during the time of the war...and Kabuto has found out about it...and is intending to kill Orochimaru one day but he is not strong enough only as strong as Kakashi. Because several time during the Manga Oro says if you want to kill me ..something something....and i think Kabuto is just trying to get Oro's secret jutsu's by gaining his full trust.

what are Kabuto's real intentions.......he is actually a nice person to help out Hinata and naruto during the chunnin exam.....but that can be answered by saying Oro wanted Sasuke to reach till the end to test him....but why help Hinata?....hmmm