Would Canelo Alvarez, Danny Jacobs, and GGG be able to compete with the Fabulous 4 from the 80’s?

You’re missing the point. Evidence is that many boxers already were draining even for same day weigh ins.

 

At that time, that was true, guys stayed in the same weight class. Today, the strategy is to boil down as far as possible to gain as much of an advantage as possible. With 36 hours to eat and drink, as opposed to 8 hours, the target point is two or three classes lower.

 

They can all compete.

GGG got his biggest fights late on.

At his absolute peak, he likely beats Leonard, Hearns and Duran at MW and might probably lose to Hagler.
Marvin was a sharp lefty puncher with skills and a good chin also used to boxing over 15 rounds. I give him a 65-35 edge over Golovkin.

Canelo can probably beat Hearns and Duran on his best night, those could be close on points, could struggle with Ray, 50-50 and loses to Marvin. (All this is assuming fair judging!)

Jacobs competes well, but just does enough to lose against most or all of them again. He could beat middleweight Duran on a good night.

 

Like Hearns at 147?

 

What are Jacobs' best wins again? I just feel like I am missing something here. He has a feel good story, and seems like a nice guy, but, he is just not an elite fighter. He has acquitted himself well in some losing performances, but, he is lacking the fire, skill, and killer instinct that separates great fighters from good ones. His loss to GGG really showed how much GGG slowed down. I didn't find either man's performance all that impressive. And, obviously, either did Canelo and GBP. That's why they finally made the fight. And Canelo just cruised through his fight with the much bigger (but rarely dangerous) Jacobs. The outcome of that fight was never in doubt (except from people who hate Canelo). Although the much smaller Duran could conceivably lose to Jacobs on a bad night, Duran wins if they are both at their best. Hagler and Hearns would go right at Jacobs and decimate him. Leonard would likely just win a wide decision at 160. That is, unless Jacobs shows an uncharacteristic fire and actually tries to hurt Ray. If that were to happen, Ray's infinitely superior mean streak would surface, and he would knock Jacobs out. All of these men beat numerous fighters leagues above the Daniel Jacobs of the world.

 

What are Leonard's best wins at 160lbs?

 

He beat arguably the greatest middleweight (and, without argument, one of the top ten middleweights) of all time.

 

One fight,and lets not pretend Hagler was at his best.

 

I agree it was not Hagler at his best. But Hagler and Leonard were both in their thirties and near the end of the line. And, I will take Hagler's worst to beat Jacob's best anytime.

 

Maybe check his record. Sulecki, D-Chenko, and Quillin is solid. I also thought he edged GGG.

 

Compete yes lose yes! GGG or Canelo would be out of their leagues against any of these fighters maybe they could catch Hearns which i doubt,, Yes GGG and Canelo are big fish but in a small pond,, Back then they would be small fish in a big ocean

 

I watched all those fights. With the exception of icing Quillin, I was not impressed. And, I think that result was a bit of a fluke. If they fought 10 times, I doubt their fight would have ended that way again.

 

Fighters have always cut weight. But when you weigh in at noon and fight at 8, you eat a meal and drink, but not excessively. So you gain back 3-4 pounds, if that, after you eat, move your bowels, and rest before the fight.

An extra day allows for more intake of calories and fluid and still time to let it settle.