Underuse of cavalry in the roman army

[Flavivs Aetivs]

Hmm... I don't know. As far as I recall the only Greek troops were Paramonai who are recorded by Pseudo-Kodinus and some other guy (I can't remember, some greek name). You might be right though. And they certainly were using pretty much just mercenaries. The pronoia seem to have retained a rather byzantine style.