Life In 19x19

We can see the results of this the Online Tygem Tournament http://www.tygembaduk.com/tygem/list.asp

But who are the players? It's pretty frustrating that we don't know who's who .

The list of players is given:

U.S.: Matthew Burrall, Wei Chen, Daniel Chou, Bert Hallonquist, Kevin Hong, Dae Kim, Sooil Kim, Ben Lockhart, Andrew Lu, Eric Lui, Daniel Puzan, Cherry Shen, Justin Teng, Aaron Ye, , Vincent Zhuang.
Canada: Will Gan, Juyong Ko, Bill Lin, David Lu, Jing Yang, Oliver Wolf.

Can anyone match usernames or something?

I only recognize two obvious ones: Daniel Chou (Dchou) and Bill Lin (billtylin)

I used to know germgo, Demonstyle and Applejacks, but I forget

Wasn't sentinel an old nick of Eric Lui's from back when he played regularly on KGS and switched accounts just as often? Not sure about that.