RR, we've bred back two different kinds of RSLs. It is a crap shoot what you'll get. The under lying genetics get exposed and uncovered. Or, the underlying colors get covered in white or black. It is impossible to say. We've gotten lots of variants. I'd assume the OP will as well.
As for performing a click below, this, again, is just our experience. Most "makers" of these RSLs, first generation, are double breeding. In other words, they are breeding the cock line and the hen line. When mated for the chicks they are going to sell as RSL (whatever made up, cutesy marketing name they apply) there is what the race horse breeders call "a nick". That vigor, that unique feature is mostly gone in subsequent generations. It's a one time deal.
Again, in our experience, they'll take longer to POL, be all over the map in terms of size/weight, and just be far less uniform in virtually all aspects. Egg color will now vary, as will egg size and quality. Just our experience. Behind the typical RSL is 4 grandparent birds. So breeding RSLs is a crap shoot, or a Forrest Gump box of chocolates thing. "You never know what you're gonna get"