The reason PP said Rumble could say isn’t the one that is suppose to say who can stay and who can go?
Well we don’t know exactly how NL works yet but it seems to me that PP probably has complete control over who stays. He “let” Bae go when it was the right time. He “let” Hook leave because he needed Hook in FTL to be protected, to meet Emma, to get her here, ect. And if PP is Rumple’s brother he let Rumple go back home to FTL when Rumple was a boy to grow up, probably at Rumple’s request. But in the scene Felix says that PP will let Rumple stay, UNLESS Rumple has come for Henry. Which means that on some level PP is actually OK with Rumple. Unless Rumple interfers with PP’s plans.
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"He was a lot of things to me" "The only conclusion was love"