He basically gave you all the information you need.Fullscreen does not have specific gaming licenses(that I am aware of), but they do accept gamers with commentary on videos. Subscriber count does not matter at all. Views matter. Usually new Fullscreen partners have around 1000 views per day, but you can get accepted into Creator X (Fullscreen subnetwork) with around 1oo views per day. Also, already being a YouTube partner does not matter. It will slow down the process a little though.
I'm not linked with AdSense, I basically just monetized to get thumbnails.He basically gave you all the information you need.
However have you tried to apply to gamer specific networks? They'd probably be a better fit for you stating that you'd probably get gaming licenses through those types of networks. Because honestly, being partnered or not doesn't stop you from getting hit with copyright violations.
Monetizing through youtube actually slows down the process a lot, because Fullscreen has to get your account released from adsenses.