Now your taking thing left because your argument doesn't have credibility. We don't need to discuss the mechanics behind how Sarada was conceived and we don't need to see the *** to understand how she was produced. Sad counter Aznkidd.
We are talking about "abilities" but specifically abilities prevalent to being an Uzumaki and the manga/databook has perfectly stated that Kushina was the only wielder of Adamantine Sealing Chains and that Karin used an incomplete version "Adamantine Attacking Chains". No where within the manga or any other factual relevant information does it insinuate that Mito or Nagto had any of those variations of chakra chains.
Mito was described a powerful Kunoichi who used "Finjutsu" and her powerful chakra to seal and repress the 9tails (manga fact).
Unless you can provide scans or facts it's fanfic.
There is no sad counter lol, you dont see how they do it. She can also beg orochimaru to inject Sasuke sperm into her egg. Since there are no manga scan as you said, so everything is possible.
Keep in mind as long as no manga scan to prove they have ***, you can not go with the very basic logic " common knowlegde ".
Just like Uchiha has sharingan as genetic, but we havent seen many uchiha activate their eyes by emotion due to lack of scene time, we cant say all of them dont have sharingan if they ever go into emotional mode...
Just like 3 out of 4 pure uzumaki blood have chakra chain, but the last one has lack of scene time and doesnt has chance to show her version of chakra chain. We CAN NOT say she doesnt has it. Because why ?, because the author is not dumb, he makes it as common knowlegde that this part of people acquires this and that, or simple you eat this ramen, you will shit out of it later...
Keep in mind that not everything has to be showed to understand the very basic of common knowlegde.