Because Dober Man was taken, I guess.

Stephen is stubborn and refuses any kind of help or advice, even from the more experienced heroes in town, As best as Dark Shepherd can tell his suit is little more than a spandex like material. He has no defenses against bullets or blunt trauma and all he has for fight experience is fist fights, and he never got into a lot of those. He currently trades of the threat of his size.

Will he learn or fail in the final way? Time will tell.