I have played w/ Yan for probably a year now, both in general and in terms of 6's. While I would call doubt upon his identity as a 63yearoldchinesechef, I have nothing but praise for his dedication to TF2.
When I first met Yan I realized that I had found a friend who took this game SERIOUSLY, and who would be quick to point out flaws and advantages in plays and positioning quickly upon viewing demos. To any mumble atmosphere, Yan brings a funny but very knowledgeable insight to everything that is going on.
While Yan hasn't played for 2 seasons, his abilities as soldier are still up to snuff, and supplemented with his gamesense, he'll be in the right position to make the right plays at the right time.
Best of luck Yan