Round up of the results, since this scenario was controversial.
Overall there were 7 Roman wins out of 41 matches played, a 17% win rate. It was always going to be tough on the Romans, but maybe tougher than I considered.
Interestingly, 5 of those 7 wins happened in the top 5 pairings. So be it skill or luck, or I'd suggest both, the top players managed to ekk out Roman wins.
That being said, I think this was a scenario the Gallic player could lose, the Romans had to endure.
"I will either find a way, or make one."
attrib to Hannibal Barca