hahaha sounds like someone went to the same supply store as me, picked up two BR's one monday, then two GC's that same friday. my BR's are 5 weeks and GC's are 4 weeks, and everyone is outside and doing fine( but im in south GA so its 90 during the day here) as far as size goes, my BR's look larger than the GC's but they are all fluff, weight and development size they are about the same. however, my BR's feathered out MUCH quicker. they are almost completely feathered except for theyre bottoms. while the GC's are feathered except for a small amount of fluff on the head and neck area, and theyre bottoms. also bear in mind that the rock are about a week older then the comets. not sure if it helps, but tis what i can give. if you need pics let me know and ill see what i can come up with in the morning.