I followed a similar route. I had 4 -1.5" orinos and 2 oscars about 2". The oscars will eat anything but they didnt eat the bass, In fact ultimately the smaller oscar pestered the bass to death. I never saw the dead fish but big pleco probably ate them.
So now I have some more oscars all about 3 to 4" and I have 2 kelberi about 5 1/2". So far Oscars not a problem. My live and learn - If you are raising small P. bass get them up to size (maybe 3 or 4") before adding other cichlids. I hear a lot about fear peacocks will eat small cichlids. I'm not sure this would happen until bass are closing in on 8" long.
I think the PBass of Yukon Blu will be big nasty adults by now! It's been a little while since he posted this
PS: I fed my 2 red acaras (who were destroying everything in the small tank) to my peacock bass when the bass were only around 6 inch.... They loved em ;-)