No, you misunderstand. (or I did not explain)

When the good old Roman came and said hello, they said that all our gods were perfectly accpetable, but they needed to fit into their pantheon so we could understand it all.

Ogmios, being the god of eloquence should (according to the Romans) have been a peer god to Hermes, but the gauls did not agree, they felt that the power of eloquence embodied by Ogmios created a being of much greater power - comparable to Heracles.

Thus when a greek chap saw a pagent in Gaul, he was surprised to see this odd combination of an old man dressed up as Heracles, with gold and amber chains connecting the ears of his followers.

The old man bit was to make a point - a god armed with the eloquence of Ogmios did not need any physical power to be as strong as Heracles, he got his lion skin and club from his wisdom.

Unfortunately, a number of commentators in my mind have been over keen to draw relationships between this single (and only) written documentory of a gaulish god and other images that they have found. Thus the club has been argued as being a sign of Ogmios, and people have said that Ogmios was depicted as a warrior - this is a misinterpretation of the events outlined above.