I disagree, there is, per word of god a real risk the Athens night shove their nose into the West, in fact they did so in OTL and there is serious fear they'd do so TTL, it's not just the Adriatic, namely the potential trade routes we want that Athens may want as well, but all of Italia, how long until they start messing around with the power balance we want to preserve? Stopping us from doing what we want to do with the Dauni, Adriatic and internally.
Except Korithinos cannot challenge Athens, it's already lost several times. It won't be a fight, it'll be a quick defeat, and then the pro interventionist Athens might turn its eyes West, as it did IOTL and as in universe peoples, with feet on the ground, also fear.