I have to point out that the manipular system of the Romans, just as the phalanx or any other 'system', was not an abstract method of tactics developed by a fore-sighted Roman General Staff and War College. There was no such thing. The maniples developed over time, due to many factors, few of which could be expressed in the stats. It was deeply rooted in the roman notion of virtus and the importance of single combat, and although it was successful for the Romans, it would be a mistake to apply it to anyone else. Read Lendon for the best discussion of this, but remember, a real live roman Triarius didn't know what his AP rating was or how many hit points he had.