Original: Further support to the single body origin comes from the known colors: all2 the satellites appear light red, with color indices B-V = 0.76 and V-R = 0.47 and infrared spectra, similar to D-type asteroids.
Simplified: Further support to the single body origin comes from the known colors: all the moons appear light red, and infrared spectra, similar to D-type asteroids.