Byakugō = Epitome Of Healing (added bonus).

[FemmeFatale]

Naruto's palm > Byakogou

Uzumaki + Ashura + Hagoromo >>>>>>> Byakogou

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I dont see Gai's Body Healed. He just gave him lifeforce, nothing more.
He tried to do the same to Obito, but Sakura noted that he was going to die anyway.
The IT wrapping Gai up probably saved his life, so that Tsunade or Sakura would be able to heal him

 

[JustSomeRandomNinja]

Kaguya/Juubi Jin>So6P Naruto > Kyubi/jin >>>>>>>>>>>> byakugo

Naruto didn't heal Gai fully then cuz Madara was right freakin there