In my not so humble opinion, if you do not cube cut it, you are doing the tobacco a disservice. I have tried all the methods and the cube rules. I would take the black center and cube that into 1 mm squares and then sprinkle them every so often as you gravity feed the pipe, this has to be done in such a way as to make sure you have the proper amount of black stuff at every level. If you have read this far you have probably figured out I am full of shit, so just do what ever floats your boat.
Seriously though, I would try cubing and folding and stuffing to see which one you prefer, not a fan of rubbing out unless you mean breaking it apart into big chunks with your fingers. Rubbing it out into a ribbon cut in my opinion defeats the purpose of smoking a flake.