Obito sacrificed kakashi for him to be able to jumb to kamui and also did guy just block the black ball sent by madara with his body and there is no scratch on him
The gates give some kind of immunity like they give strength. Otherwise, it won't be possible for the user to survive the powerful energy developed inside his body.
I dont think the orb was powered by onmyuodon, madara would risk damaging his rinnegan and maybe even kyuubi.
This would make gai deflect/tank the orb as obito did in his base.