Whoa whoa whoa there dasamm, I think you'll find, if you look back at all your tapes, that it was RJJ that wasn't interested in the Calzaghe fight. For him, Calzaghe wasn't a name in the US, and it made no sense to him to risk that unified title of his against an up-and-comer from Britain who had looked really good but hadn't beaten any real american fighters prior to then.
Also, Calzaghe wouldn't have sacrfiiced his WBO SMW belt to move up to light-heavy, unless it was for a fight against RJJ, and he wasn't interested, so that's why it wasn't made.