Re: how effective would the lighter heavyweights be today?
I reckon Dempsey and jersey could carry the weight well enough. Maybe schmelling as well.
I think if you get an elite 210 man vs an elite 240 man the weight isn't as guys a deal and it is more a matter of styles clashing to determine a victor.
Holy fought even with a prime bowe. Mercer took Lewis to the limit. Byrd had vitali quit on his stool. Haye fell short against wlad but was he giving it his all in the ring? Young beat foreman.
basically I think that providing you can break the 200 barrier and retain what makes you special, you have a realistic chance vs any heavyweight in history.