Which Boxing Legend Do You Wish Was Just Entering Their Prime Now?

If you could have any past champion (or contender) coming on to the boxing scene now, who do you think would make the biggest impact on boxing, and who would put boxing back on top? As much of a fan of Ali that I am, he probably wouldn't have much impact on the sport today as he did during the civil rights movement. But I feel somebody like a young Tyson, or possibly somebody like Dempsey would get people watching boxing again.