Anton and Ariel are also not cursed, but Jefferson technically was but Regina let him have his memories. He was still brought there by curse.
Anton was brought on Cora’s ship same as Hook. Ariel of course swims around. So I guess it depends on Garcia/Garcia-Swisher’s schedules whether they’ll be popping in if this does turn out to be a curse-in-reverse but it would make a sort of sense. If so, though, these 2 characters may play a role (hey Tiny get those beans to grow, maybe Ariel can get you some seeds !).
If Wendy is in the box and in SB, she too would not go back, plus her brothers. Not sure if it would affect WL timeline but guessing not, just grabs everyone in town
“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass