code: public void addWhileRunning(Cursored cursored, Sequence sequence)
      {
          SequenceGroups.addSequences(this, SEQUENCE_UPDATER, cursored, sequence);
      }
docs: Adds a sequence to the sequence group after threads have started to publish to
  the Disruptor.  It will set the sequences to cursor value of the ringBuffer
  just after adding them.  This should prevent any nasty rewind/wrapping effects.
  
  @param cursored The data structure that the owner of this sequence group will
  be pulling it's events from.
  @param sequence The sequence to add.