MIAMI – Trainer Ron Gaffney has already transformed Rule Number Six from a useful allowance and starter allowance horse as a 3-year-old in 2012 into a stakes winner this season. Gaffney, a transplanted New Englander, is hoping that metamorphosis will continue Saturday when Rule Number Six puts his three-race winning streak on the line in the $75,000 Memorial Day Handicap at Calder.