Re: how effective would the lighter heavyweights be today?
I think it is certainly possible for a lighter heavy to get a bauble. However, as it did with even a great fighter like Holyfield, fighting giant, powerful dudes every time out will make for a rocky and uneven stay at the top. The wear and tear, the x factor of power, not only in punches but in the clinches and other action, and the durability make for formidable obstacles for a smaller fighter to overcome every time out. It would be something like Usain Bolt giving his opponents a 3 meter head start in every race. He is still going to win most of the time but it would be too much to win every time.