I dont think the said technique is medical technique at all .... Orochimar's problem remained even after he switched to a perfectly healthy body. It was a damge on spiritual level, any problems of the body that healing jutsu heals would have been left behind when he switched bodies.
Because he still didn't have a chakra/life in him. Orochimaru already knew switching to a new body wouldn't work.. lol. Hence why they already had the rds reversal scroll and etc.
Do you not remember Chiyo revived Gaara back with reanimation jutsu? If she can revive another being by giving her life, why can't the BEST medical ninja, who was leap and bounds superior to anyone else in the function of the body, not be able to revive his arm? Come on now man.
You are taking orochimaru for a retard. Not to mention his first option was Tsunade, and not the reversal itself.
But staying the OT no one has been able to counter the points i made, regarding Sakura > Kabuto.
All I see is people bringing in other things for Kabuto that are not medical ninjutsu. For example, Sasuke's revival.. it was not pure medical ninjutsu. It was medical ninjutsu + transfering of dna (something Kabuto stated himself). On top of that there hasn't been a poison as hyped up as Sasori's, yet Sakura countered it with ease =D.