Q&A

Q: Is Yoshiko the strongest member of the Ōtsutsuki Clan?
 A: Yes, 2500 years ago Yoshiko absorbed half her clan in one fell swoop after a civil war had broken out and then she proceeded to eat the fruit of a God Tree and artificially create a Tailed-Beast and seal it inside herself thus becoming the strongest known member of her clan and even 2500+ years later she still rivals Kaguya Ōtsutsuki and Isshiki Ōtsutsuki combined.
Q: Can Yoshiko defeat Juubi Madara and Obito?
 A: Yoshiko has way more power than Madara and Obito combined and is faster on terms of reactions and speed. Yoshiko was able to sneak up on Naruto and Sasuke during their spar the same Naruto who dodged Madara’s light. Yoshiko also easily kept up with Naruto in terms of speed. Yoshiko also has a dimension swap so she can technically trap Obito in another dimension since Jubbito cant use Kamui. Kamui also has the Kekki Mora of the Ash Bones and she can form them which can One shot Naruto and Sasuke, and I doubt Madara can tank it either. Yoshiko simply has way more than Madara and Obito.
Q: Why didn't Naruto protect himself from Yoshiko's All-Killing Ash Bone with his Truth-Seeking Balls?
 A: Yoshiko is extremely fast. Her speed is far superior to Naruto and Sasuke as she could literally appear in front of any of them in the blink of an eye. Yoshiko could also knock them out of the way seeing as she’s the original chakra user and touch them. Him defending himself against Yoshiko with Truth Seeking Balls most likely would’ve ended up in the same end result.
Q: Is Yoshiko the strongest shinobi ever?
 A: Yoshiko Ōtsutsuki is the 1st Yamakage, and she also happens to be the strongest ninja ever. Many consider her to be an actual god because no one can match her prowess in battle, which makes sense seeing as she possesses an absurd amount of chakra. She can even heal serious injuries without using any hand signs.
Q: Who was the strongest during the Warring States Period?
 A: Akitomo Omori was the strongest person to exist during the Warring States Period. (excluding Yoshiko Ōtsutsuki, Hashirama Senju and Madara Uchiha) 
Q: Whhy is Akitomo Omori still alive?
 A: Akitomo Omori despite the fact that he has the Death Mark and was supposed to have a short lifespan of 25 years, survived to be 110 years old, although he would eventually go blind.