Since C. (L.) Pacavia is a hybrid of 2 similar species (tenebrosa x purpurata) it is very predictable for shape. Colors tend more towards purpurata much of the time but flowers almost indistinguishable from tenebrosa are also possible.
C. (Lc.) Massangeana is (schilleriana x tenebrosa). One picture in OrchidWiz shows a flower with intensified tenebrosa colors with a shape that is intermediate between the 2. Crossed with Pacavia I would expect mostly very tenebrosa-like flowers with possibly darker colors tending toward purples.
Rlc. (Bc.) Massangeana would be a typical early Bc. type hybrid in a variety of colors. I can't find a picture. If the cross does use that it is too boring to even contemplate what the result would be.
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