Initially I would have said Kabuto, but now that I think about it, I don't see how he wins, especially given all the restrictions. Two guys constantly blitzing at instantaneous speeds all over the place and being able to mark each other alone will give Kabuto problems. All that needs to happen is marking Kabuto which one of them should be able to do with a distraction from the other and then the match is over. The only person to react to FTG at all was Madara in his Jinchuriki state (and against Tobirama utilizing Hashirama's Sage Mode) and he didn't even actually react to FTG itself, only the attack that followed.
Don't see any of them marking him though. He has the ability to use Kimimaro's bones like
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and his ability to gain a new body [
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]. Genjutsu could be problematic with no intel on it and didn't seem breakable like the one Tayuya used due to the SM enhancement [
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]. His snakes have dodged a Susano arrow from close range, he shouldn't have any difficulty reacting to their attacks unless he's marker, and even then he can defend with Yin healing, White snake healing, Uzumaki healing while also being capable of getting a new body immediately. Not to mention, he has the ability to block out chakra substances from his body [
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] if he chooses to use Kidomaru's DNA, meaning rasengan's are useless, scratching him at most. I believe Kabuto takes this with his poison though, once Oro's form is cut as they have no intel on its poisonous exertion. If by the odd chance, Kabuto does get tagged and hit, he will know of their abilities, heal, and then counter by having his snakes constantly guarding the marked area, and they will do so well, as they have caught a point blank Kusanagi throw from Sasuke and dodged his Susano arrow, can telepathically communicate with Kabuto, and grow by a mere hand seal.
There are too many restrictions on Kabuto for him to win.
Unrestrict any and he one shots since there's no intel, so...