Yin = Genjutsu.
Yang = physical power.
Naruto regenerates body parts but can't stop a dying person from dying.
Sasuke seal on Naruto's seal might do the unexpected. That is stop a dying person from dying.
Since we haven't seen anyone dying yet (apart from Obito but still not on the verge of death) Sasuke's seal might play its role there.
That its out of the extent Sasuke's power, I believe. I speculate he would work together with Obito to recreate the barrier as Sakura is no use to him anymore.
Could he give Chakra ?
But Sasuke doesn't possess that much amount of chakra. He himself gets exhausted after two or three use of his Rinnegan ability.