FWIW, I was never the one arguing definitively that the planet doesn't belong to the Baku. However, I think as it isn't their planet of origin that there is room to debate how much right they have to the planet, and how much of the surrounding space they're entitled to as a consequence, and especially whether "amount of time on said planet" is really an appropriate criterion. Where do you draw the line? 10 years? 25 years? 50 years? A century? Are we going to say that if colonists are on a planet 9 years than the planet doesn't belong to them, but after an additional year it does? That seems quite arbitrary; almost as arbitrary as saying how many people have to be on a planet before they can call the planet their own.
In any event, as I've said before, I would hope the Baku would be solicitous enough of other races that they would be willing to share the benefits of the rings they were lucky enough to find before anyone else in some shape or form, but I don't believe there's anything in the screenplay that indicates they're willing to take the first step toward sharing what they were, again, lucky enough to find first with anyone else.
So we're back at me not having a great deal of sympathy for people who are comfortable sitting on the 24th century equivalent of the Cure for Cancer. And sure, maybe there wasn't enough testing done to confirm that that would work, but isn't that just an argument for allowing more testing to be conducted rather than summarily dropping the matter?
To backtrack to my original example, I do hope that if aliens colonized Mars because it was the only way they could stay alive, that humans might be kind enough to allow them to do so, or to work out some option other than "Mars is ours; buzz off!"