i think the rexXrex makes a few double rexes, few normals, few rexes. double rex bred to normal makes a few rexes and normals??? i dont know really i havent got my double rex male to breed yet (hes gay) but i have had a rex breed some normals and some other rexes and got rex babbies. one thing i did notice is some turned out to be rexes alot later than others in the same litter... id say 2 weeks till they turned out to be rex.
just for kicks here is a naked one i have