Thats actually likely not accurate. Dvalin is a (demi)god who was previously a mortal, which means that there was sufficient dwarven will and respect behind him to empower him to that state. The other times weve heard of such an event going on, it was an effort of nearly the entire race to muster that kind of power and worship. So to that end, its likely he was actually "voted" to be there, under a certain use of "vote".