How would adding LIVE sand cause a cycle? Haha. You people with the term "Cycle". The only way that would happen is if the sand was full of hydrogen solfide and waste. That is why he would just rinse it in a 5g bucket with sw.
CK, Make sure you leave the lights off for a few weeks when you add the sand, Cause there will be no bacteria on it and you will get a massive alage bloom.