Yes, I refer to the city from the Iberian Peninsula. At the first stage, Massilia had a lot of influence, for example the Greek city had a good trade with several eastern Iberians (there are even some lead letters that show this trade), that is Arse-Sagunto, however since fourth century B.C. Massilia started to lost the influence, for example Emporion was a trade place but the settlement became to a real polis with his own coins in this way, Massilia lost an important "ally", in fact the Phoceans from Massilia founded Rhode near Emporion to recover their influence but they didn't get it. The Attic pottery was the most imported product and the trade routes were the following:
Greek trade: Athens ->Sicily -> Emporion -> Iberian peoples.
Phoenician tarde: Athens -> Carthage -> Ebusus -> Gadir/Abdera/Sexi/Malaka-> Iberian peoples (especially the oretani from Castulo )
During the fourth century B.C. the Attic pottery was very important but after that it disappeared and the local pottery from Ebusus and from Emporion replaced the Attic pottery. As you can see Massilia didn't participate in this phenomenon but the city had good wine and Italy was the objective. So, yes, Emporion and Athens were more influential than Massilia in this case, even (if we believe some literary sources) Emporion was linked with an Iberian city, so there were two communities "in a city", however this Iberian settlement has never been discovered by the archeology.
EDITED: I have spoken with regard to the Iberian Peninsula, for example several northeastern iberians copied the coins of Emporion so Emporion had more
cultural influence than Massilia but as a general level Emporion was only a very small city with a limited population, in summary Emporion and Massilia can't be compared, the comparison is like a capital and a little village.
This is historical fiction, but the EB2 campaigns are also historical fiction after all, so why not? maybe, if they had been able to get a better position after the Battle of Alalia.
As a personal thought, I would like to play as a democratic expansionist faction from Massilia instead of the historically oligarchy and in this way I would avenge the event of Alalia, and I would create a western Greek league, but I cannot decide if Massilia is a faction and I recognize that is not the better "accurate historical" option but it would be cool.
