Both were useful and stop creating obvious ass threads. You know the answer, I know the answer, everyone knows the answer. Without a medic/healer most ninjas are screwed.
Both was monumental really. Sakura was in the perfect place twice. Although in the Kamui dimension where she she was asked to stab Obito's eyes, damn her courage depleted hard
WTF logic is sakura fuelling obito's kamui, obito was using his own and naruto's chakra may be for using kamui sakura was only healing the stress caused after using kamui.