Yes, it was the Earth's set of Dragon Balls that granted the wish. Since my people didn't believe in reviving the dead the Namekian set could only revive one person at a time. But Earth's set came about through peculiar circumstances and thus had none of our traditions attached to it... and now Zarbon has them...

[Dende nods at the second bit]

Five villages slaughtered, including my own. The only reason they didn't slaughter the last village and Guru was that my village elder, Moori, destroyed the devices they used for tracking us...