For Valentines Day I give you my heart please treat it well, because seriously without it I will die!! lol
I just thought of something, what if like the Sharingan the Chakra Chains also has a criteria, only instead of being close to death yourself it's seeing the person you love coming close to death? For Karin it was the trigger of Sasuke coming close to Deaths door, but Naruto has not awoken it because Sakura has never been close to dying with Naruto around, Ofcourse if that theory is correct it would put a major dent in NaruHina fandon as it would prove Naruto is not in love with her, she's been on deaths door twice infront of him and he's not unlocked the chakra chains.
I seriously hope we get an explanaition next chapter, I can't think of what particular trigger awakened Karins bloodline limit but never awakened in Naruto, and if this Manga end without Naruto unlocking atleast one of the Uzumaki bloodline limits i'll be seriously pissed. Ofcourse it's possible that Orichimaru experimented on her using Kushina's DNA like he did with Yamato...which would be freaky because then it would mean Karins is partially Narutos mothers clone and we really don't want to go there.
Edit: One last thing I just realised, once Minato transfers the half of Kurama to Naruto he'll likely also disappear from losing the Bijuu, with the last person he'll likely talk to is Sakura, so I wonder what his last words to her be? I wouldn't be surprised if it sounds similar to a father asking his daughter in law to take care of his son.