One thing I realized from doing interviews with the Southeast Asian artists I met at STGCC is that they have agents working for them, getting them the contracts and the jobs. Especially so for the Filipino and Indonesian artists who might need that link to DC and Marvel Comics. In the case of Ardian Syaf, he needed someone with the linguistic ability to negotiate with the comics companies. Interestingly, both Carlo Pagulayan and Ardian had European agents instead of US ones. (unlike say, Sonny Liew) In any case, as pointed out by CB Cebulski, given the long distance between Asia and America, even having an agent in Europe meant it's easier for them to fly in to San Diego to represent the artists for work.
This doesn't mean all Southeast Asian artists working for DC or Marvel has an agent. One of the Malaysian pioneers, Tan Eng Huat, doesn't have an agent as he was talent spotted by Andy Helfer of DC in 1999. One job leads to another and Eng Huat's schedule is packed these days.
Perhaps having an agent is part of the professionalization of the medium in this region. One day we will have local talent companies starting to represent comic artists.