Ryback is more of a psycho sid than a Goldberg in my opinion with that rage he carries. He's not going to be the wwe champion anytime soon, so have him pursue the United States championship against the anti American champion in cesaro. If you want to do the Goldberg comparison then yes put the belt on him just like Goldberg did on his route to the whc.
As for his DDP, Bryan, cesaro and maybe big show can fill that roll. I'm just not sure there can be someone of that caliber for him, and I really don't think the guy is even on the roster yet. The fans love him so just keep trying with other superstars and try to stretch his matches out.