Rukkuz Blitzwizza is not so much a Leader as a Focal Point. A total Speed Freak, Rukkuz was uninterested in Wazdakka Gutzmek's interplanetary Highway, preferring to take "da backroads". As such, Rukkuz and his small group of drinking cronies have ridden their bikes across a vast number of worlds, with no particular destination in mind.
Seeing as the most interesting worlds tend to be populated, Rukkuz and his small group of biker nobs often end up fighting a wide variety of enemies. Other Ork groups keep an eye on Rukkuz, knowing that where he goes there's always a good fight. As such, it's not uncommon for Rukkuz to ride through an Imperial City followed by a seemingly random assortment of other orks following in his wake.