Lets have some people coming up with anyone they think would beat the person in the weight class above that holds the same title as them. e.g. Wba Lightweight champ Juan Diaz would definitely go up to light welter and beat the wba champ Gavin Rees. See what ones you can come up with.
Some more, I personally think British champ Carl Froch would beat LIght heavy british champ Tony Oakey
Interesting one, I cant actually think of that many tbh. I reckon Bute maybe could move up and beat Woods. I reckon all 4 welerweight champs could move up with a decent chance of beating the corresponding light middle champs, which goes to show how strong the division is
Also same with all super middle champs could move up and beat corresponding ligh heavies, with the possible exception of WBC - Kessler-Dawson
Sorry not what you really wanted----hypothetical---I'm WBA featherweight champ and I'm gonna challenge the WBA Welterweight champ----have I got to meet a minimum weight requirement-for this fight to be sanctioned ???