Deconstructing Polybius - an example

[Domen]

As for the Roman rout, cataphracts would not follow them at some great speed and certainly would not precipitously ride forward after the enemy,

Why they would not follow them or ride forward after them at some great speed, etc., etc. Is a horse slower than a heavily armoured human? Accounts say that he chased the Romans up to their camp.

Also - Antiochos had apart from his 3000 cataphracts, also 1000 Agema, who were not so heavily armored.

The verb used by Appian is "to cut through" (diakoptein) and certainly describes a "breaking through" assault.

So exactly what I said - they smashed a relatively short section of the Roman battle line.

that is that the allies were not included in this number

Indeed, so probably casualties of the Latin allies were at least similar or bigger than those of the "Romans from the city". When it comes to Eumenes - 15 dead horsemen, but how many infantry (if any - because Appian doesn't even mention their losses, looks like he assumed that there were none).

where did I speak of any "brunt of combat"? I just wrote that "the battle was won by them",

I'm interested to see what is your theory then. How could they win without fighting?