Why not? Why she cannot do that if she wishes to? Sakura is the mom. Get over it. Karin told Suigetsu to send apology to Sarada for misleading her. So that's it.Why keep Saura umbical cord? Sakura susppose to keep, also why did she think she was connected to through imbical cord, even it wasnt her, also why did she give salad glasses?
Then there are news that he declared complete retirement from it a this point.. So his story is REALLY finished. No more plot twist since the plot has ended already.