HALLANDALE BEACH, Fla. - The complexion of Saturday’s $100,000 Tropical Park Turf at Gulfstream Park changed suddenly on Friday morning when trainer Chad Brown revealed he will scratch the 2-1 morning line favorite Analyze It due to a quarter-crack issue. The news also will have a profound impact on the Rainbow 6, which features a mandatory payout on Saturday. The Grade 3 Tropical Turf is the penultimate leg of a sequence that figures to offer a final pool of $6 million to $8 million if not hit the previous afternoon.  :: Enhance your handicapping with DRF’s Gulfstream Park Clocker Report The Rainbow 6 will kick off on race 6 of an 11-race program that begins at 12:05 p.m. The defection of the multiple Grade 1-placed Analyze It, one of 16 horses tendered invitations to the $1 million Pegasus World Cup Turf on Jan. 23, still leaves a very strong and now more evenly matched field of eight in the one-mile Tropical Turf. The group is led by the Grade 1-placed Casa Creed, two-time Grade 2 winner Ride a Comet, multiple graded stakes winners Frostmourne and Admission Office, along with defending champion Tusk.   Casa Creed exits a 12th-place finish in the Breeders’ Cup Mile, concluding an 0-for-5 season, although he finished third in the Grade 1 Fourstardave and fourth in the Grade 1 Shadwell Mile. Casa Creed is no stranger to the local course, having won the Kitten’s Joy here as a 3-year-old during the winter of 2019. Ride a Comet had his career put on hold after a promising 3-year-old season during which he won four of six starts including the Grade 2 Del Mar Derby on turf. He came back from a 25-month layoff to make two starts in 2020, winning an allowance race as a prelude to his victory in the six-furlong Grade 2 Kennedy Road, with both races coming over the synthetic surface at Woodbine. Ride a Comet has trained extremely well for his return to turf since arriving at the Palm Meadows training center several weeks ago.       Frostmourne won the Grade 2 Penn Mile and Grade 3 Hill Prince within a seven week span during his 3-year-old season in 2017 and is another in this field with major gaps between starts, having run just once during both his 2019 and 2020 campaigns. Frostmourne returns to stakes competition Saturday off one of the best efforts of his career, a wire-to-wire allowance win at Churchill Downs on Nov. 5 for which he received a lifetime-best 102 Beyer Speed Figure. :: Want to get your Past Performances for free? Click to learn more. Admission Office went to the sidelines after rallying to a game head decision over Arklow in the 1 1/2-mile Louisville on June 13 art Churchill Downs. Earlier in the year, Admission Office sandwiched a pair of solid second-place finishes in the Grade 2 Fort Lauderdale and Mac Diarmida stakes around an eighth-place effort here in the Pegasus Turf.  “We would have loved to run in the Pegasus Turf again, but he hasn’t started since June and it comes up too soon,” said trainer Brian Lynch. “He’s coming back at a distance that isn’t really ideal for him, but it’s a good starting point.” Tusk rallied to a two-length triumph over Gidu in last year’s renewal of the Tropical Turf before also hitting the sidelines for an extended period, not returning until Dec. 5 to finish a tiring eighth after setting the early pace in the Claiming Crown Emerald. “He was coming off a long layoff,” trainer Saffie Joseph Jr. said. “He got an easy lead and stopped, but he got tired. He won this race last year, so we’re going to give him a chance to win it again.”