If you're worried
No...no....not worried. My comment about the Romans having heavy cavalry was pretty much tongue-in-cheek

After that, they become Legionary Cavalry, which is classed as heavy melee cavalry. Those two are basically the same: riders with some armor, on horses with no armor, wielding spears.
These guys you would expect by 150BC to 50BC.....

The SEE unit is a mailed rider on an unarmored horse wielding basically a kontos.
These guys don't show up in Roman OOB's for another 200 yrs. or so