l.
Hopkins beat Pavlik because of styles, simple as that. Pavlik's straight ahead style is exactly the style that Hopkins looks good against.
yes and no, styles might have suited him but the point people make is, he himself looked FAR stronger, FAR fitter and far better all around than his first real fight out of retirement. The longer time training showed, in the Calzaghe fight he tired badly, obviously not because of taking hard hits

, and it was close with Calzaghe getting "better" as Hopkins tired badly. Against Pavlik he looked fitter, didn't tire, appeared stronger and because of strength/endurance his style maintained start to finish, his defence and combo's were awesome. It was really a very very good performance all around.
It was 100% not the style difference between Cal and Pav that made Hopkins look so different between the fights, it was Hopkins that made himself fight differently.
I really don't think Calzaghe has "it", he's a good boxer but really does to many of those quick showy no power Khan type showing off combo's and no power combo's. he wins fights through quantity not quality and few of the worlds truly great world champions really do that.
I mean, lots of people in the next 30 years will have the titles he held, when you compare all the champions the ones that stick out will be the quality boxers, not the quantity guys and thats why he doesn't stick out in my mind as a great champion.
If he faught Hopkins how and won that might change, but in my mind he's never proved himself against the very best, against the very good he has, but the very best I don't think i've seen it.