@The:
Rebecca is only joining if Kyros dies, freeing her from the shackles of the family that she has longed for for so many years.
I had to chuckle at that slim veil of sarcasm there, and agree with you.
She has a link to the island that while possible to loose or have something come up, tis not enough to make her leave. Not even going the Franky route will work with Rebecca…. though I've not seen anyone actually use that, they seem to be grasping straws at saying "IF Kyros is dead, then she'll not have a reason to stay!"
X__X
No, because the Franky route shows that argument is flawed.
Franky stayed on an island his mentor loved. When the mentor, Tom, was taken away Franky stayed to protect it. He only left Water 7, because a- he got a bounty, b- his 'family' asked the Strawhats to take him with them, c- Luffy wouldn't give up until Franky joined.
If it wasn't for that bounty, Franky would have stayed on Water 7.
Now on to Rebecca=
Let's say her father does die while trying to restore order to the land. Why would Rebecca suddenly have no connection? I see her acting like Franky did after he lost Tom = protect their island in memory of their lost loved one.
I see Rebecca staying on the island with her aunt and grandfather to rebuild and protect Dressrosa.
And I do not see Rebecca getting a bounty that would force her to leave.
Rebecca's situation right now is like Vivi's was (trying to stop the terror of a crazy Shichibukai's plan that's ripping the land apart- did not get a bounty) and is nothing like what's drove Franky away from his loved island (Fought against WG and Marines and part of force that stormed EL- did get a bounty).