There are squads in WoW already.
XGC has a I believe two setup.
There would have to be separation of the Divisions regardless of the game we setup squads in. Our Honorcodes must still be enforced no matter what game it is. This is very important to the structure of the community as a whole.
With games like this though, I am sure you could simply make just one squad under KoG then one under XGC and one under SYN versus trying to make multiple squads in each division.
There are a lot of people in Xiled Gaming that play WoW and the other PC games and I am sure if you get the word out others will be happy to join up with you.
Use the forums to post info in that games threads and also don't forget, you can recruit new members in these other games as well.