Late Roman Army Grade/Rank List under Anastasius

[Robert Vermaat]

surely because we have no idea!

But it does seem strange that the infantry-based auxilia palatina should not have adopted the rank system of the legions, as the old auxilia of the principiate did, but rather a different hierarchy previously used only by the cavalry. 

Indeed we are left wondering as to why the army a) wanted a new rank system and b) why they never made it a uniform one.
Perhaps they saw it s a status thing?

Are you sure the auxilia palatina was infantry-based? My guess is that, although later they certainly seem infantry units, they may well have formed up as perhaps cavalry-based guard units?
Also, I don't see the later auxilia palatina as resembling the old auxilia units in anything but their non-Roman composition and the name.