As far as I know, there was no such thing like the Polybian Reforms. Polybios was a historian describing the Roman Legions of his time. The Legions underwent a lot of changes in the time following the defeats against Hannibal.
One of the most prominent reformer, espacially on the tactical use of the Legions and its parts, was Scipio. That was the reason for me to place them in the end of the Second Punic War in this describtion, the trigger in EB indicates the same.
Changes or military reforms do not come overnight. For example, the Cohors were allready used before the Marian Reforms.
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