Nope. Its 4 bosses per raid cycle. Its just that it can take groups that long to progress to and clear the final boss I dunno Destiny is pretty standardized. Most mechanics either involve an orb to dunk or throw at a boss or a jumping puzzle. Those are standardized. Most bosses have an immune phase or a soft damage cap preceding a wipe mechanic I think Destiny is really easy. Ive never watched any videos and cleared every heroic and prestige raid on my first time in with a 2 minute explanation.