Strength doesn't determine the medical prowess.
She coud heal his arms orochimaru said only she coud do that
she's weak overall, I didn't imply strength small head
What, you want to start another tsunade weak/strong argument( there have been a lot). How is her being weak relevant to this thread sucker.
Tsunade is an Uzumaki, Reaper Death Seal is related somehow to Uzumaki as seen when Orochimaru went to the uzumaki's mask temple to retrieve shinigami's mask, so most likely Tsunade knows about it, and it is possible that she does know ways to bring back people from RDS.
And in difference to Nagato and karin, Tsunade remained closer to her clan, grandma (mito) and the village, unlike the other uzumakis that weren't around, this way allowing her to know more stuff from her clan.
Tsunade is a Senju not an Uzumaki
She's a senju not an uzumaki
She's a senju not an uzumaki