Yes, FSU "convinced" the seminoles to allow them to keep the mascot and namesake. "Convincing" a group of individuals to do something tends to be quite a bit easier when you have money. FSU has a lot of money, UND does not.
Also, there was at least one group of Sioux Indians, cannot remember which one, whose Chief did not even allow his people to vote. There were others that actually backed UND keeping the nickname. The whole thing was pretty shady all-around.
At the end of the day, I think peoplemare kidding themselves if they don't think $$$ had a great deal to do with the decision.