Regarding Sharon being the one to have a severe illness, I'm a little surprised Amanti didn't include Serika in the pained people.
Of course, she's not as close has the Nambas to Sharon, but the way she idolizes Sharon should at least have her bear some sadness.
It even seems to me like the symptoms she shows leads to the same illness Serika's father died from (but my memory could be wrong).
Now, it's quite possible the pain Hibito and Mutta is so vastly superior to Serika's, that Amanti can't see it.

On another note, when they were running, I thought Amanti was seeing Mutta's and Serika's wedding