While I'm no expert myself on Oscars, I must admit that BOTH of Rapps ' fish look like orbicularis. Crassipinnis simply do NOT have colors.
They are from the Pantanal, which covers most of Brazil. Not sure about the location of the Xingu, or if it's connected with the Pantanal, but the dull, washed out blues/grays is characteristic of a crassipinnis, NOT the reds or oranges, as shown in the 2 Rapps photos. Again, just going by what I've had.