The Legion has presence but inner conflict that can be discovered IC through questioning can explain why they aren't everywhere. And you're right actually they are set up in the stadium but now call it the colloseum. The Legion is currently not an option but may be added for players later. The confliction is a lone legionaire would get shot by almost anyone. Aside from small explorer parties and the ooccasional scavenge team they remain tightly inside the Colloseum. The only thing that seams to remind anyone they are there are the beating war drums and unified shouts as they train but be weary, if you seek the Legion they will be nothing like you've seen.