As far as I know he was the only one who have succeeded in not only hacking in, but also not being traced back despite all of Valves efforts. (They even got the FBI involved.) How many of the "hackpplicants" can you say the same about? The only reason Valve even knew who did it was because he came forward to them. He admired Gabe and his team so much that his dream is to join them. All of this indicate to me that he would make an awesome employee. I have little doubt that he would have poured his heart and soul into the company had he been given the chance. In fact that is the main reason why I found the story to be so tragic.