Suggestions and guide to the heavy hellenistic infantry

[RomulusAugustusCaesar]

Let us not forget that there is a difference between
HELLENIC ( of, pertaining to, or characteristic of the ancient Greeks or their language, culture, thought, etc., esp. before the time of Alexander the Great.)
and
HELLENISTIC (of or pertaining to the Greeks or their language, culture, etc., after the time of Alexander the Great, when Greek characteristics were modified by foreign elements.)

(defintions from edictionary)

There was no Hellenistic State until after Megas Alexandros. Philippos II secured for Makedonia a place as a Hellenic State. The Diadochoi were Hellenistic, not Hellenic. But Philippos and Megas Alexandros were Hellenic, not Hellenistic.

Also, pertaining to the supposed contradictions here:

These Royal units were heavy infantry that fought in two different ways.
-1st way - They fought as (elite) phalanx
...
-Hysteroi Pezetairoi should not exist! The Phalanx was never equipped this way(mail armour was used by the Roman Legions). Actually during the late hellenistic age and mostly after the defeat and destruction of the Macedonian Kingdom from the Romans (168 BC) some formations of the Seleucid and Ptolemaic armies began equiping with roman armours and weapons and fought as they did..(these formations included mostly the thorakitai but also the seleucid Argyraspides were equipped this way some time after 168 BC..The phalanx was never equipped this way)

Perseas makes no contradiction. When he says "The phalanx was never equipped this way", he means in the Roman Manner, as is quite obvious from his post. He is not contradicting himself, but rather speaking of two different things.