the prince and princess are most likely the center stage of Strawhat's adventure.
Vivi, Shirahosi, Rebecca, Momo and even Sanji. Loki is just another prince on the list.
You took my example too far and out of my context. My context is the vision, the omen, the lore could be false interpreted, what reaction be made afterward, is not my context. And yeah context is important.
I wonder if Loki's Mom misinterpreted the omen and that omen have something to do with OP ancient history, like maybe one of the dragon in Elbaf mural.
I mean, Madam Shyarly also had bad vision about Luffy.
Why do you think he is marked since baby? It is said, that he was once back to Mary Geoise and went again. It could be in this time, when he got marked.
But why Gunko? I hope she has special background. Its suspicious that Imu keep her as pet for long time.
If Brook could release Gunko, than he will be the real soul king O0
Thats my assumption tho. Like Mero Mero No Mi Petrification muss be reversed by current df user, even if you kill the df user and transfer to the new one, the new user could not undone it. At least thats what is confirmed to be claimed in manga.
So Robin does hurt Sommer, then they are immortal but not immune to damage.
Its the same classic immortality problem, you can capture and torture them.
It would be instead an advantage to enemy, the torture is also immortal