Brodie Lee, the future Luke Harper, actually did have a run with the company, but was mostly used as a thug with no personality. While he continued to be a monster (and a follower) to this day, ROH didn't really let him shine. And while his run in EVOLVE was brief, his brutal style certainly changed the game in a promotion built around pure wrestling without rule breaking.
Jon Moxley wasn't a stranger to weapons in his days before Dean Ambrose. He was known for getting bloody on the regular, even if he was a far stronger wrestling talent than most of his CZW brethren. When the two men met well before their WWE runs, the action was explosive.