Jose - I got this Stewartii from the backyard of an old abondoned home in Coral Gables. The Momma plant was a very, very old Stewartii. I noticed one (large) branch having alot of "blotching" and lots of pink pastel colors to it. The croton was growing in a very shady area with high canopy. I made three air layers and was lucky to see they were still there 2 months later. Keep your plant nice and shaded. I believe that this sport adapted to heavy shade over time and thrives in it.
The other air layer was auctioned at Ricky's last garden tour. I have the third. My plant also sports the creamy colors and since it is kept in heavy shade, they remain on the plant - feeding off the Momma for its carbohydrates. Enjoy your plant, the house was torn down and the plant was bulldozed.