The source I'd say is in armor. And skeletal remains say a lot about average size, but what was the average size of a soldier? And would it look different on the field? And, would it make a viable unit just because of a slight height difference?
Gauls, likewise, were not very kind to the appearance of Romans, including, admittedly, height, but they also commented on the smell of Romans (one of the reasons to leave Rome, it was filthy, apparently, in their eyes), and numerous other things. Even if they were about 4 inches taller, that'd not translated well into the game. Irregardless, their size was not a major enough factor in saying that they should have their own unit.
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