Thats not how a game engine works. One does not simply drag a game's client files in a game engine and can expect it to work. He would have to reverse engineer the game. He took 4 years to reverse engineer the game server to a playable state, now think about how long he would take to engineer an entire game. Sure, he may have the coding skills but he sure as hell lacks the skill for the artistic environment required to rebuild the game. Modeling, textures etc would be impossible for him and since he always works alone that will never come to pass. I'd really suggest you to google up how a game engine works. xD
thats true and shots fired dawm