Who is the greatest researcher/scientist on NV?

[Kirin The Dragon Sage]

Tsunade because she is world renown doctor and researcher
Orochimaru because of his kinjutsu experiment and trying discover the existence.
Kabuto is someone closer to that level

 

[super yang]

orochimaru, no contest.

 

[Nattana]

Orochimaru > Tobirama >>> all the rest.

 

[Transcendence]

Orochimaru for his pure scientific intellect. He wasn't blessed with a superior bloodline. All of his work was done from his mind. Tobirama's research into creating techniques is unparalleled, but when I think of scientists or researchers in the Naruto universe, I think of Orochimaru first.

 

[FemmeFatale]

Sakura
Has feats.
Medical skill.
Poison expert.
Book smart and analytical skill

BuT I guess it's all in Tsunades favor.
They have the ability to create experiments they just don't. Sakura easily analyzed zetsus biology and had some knowledge on yamatos jutsu.
And tsunade could create Hashi body parts