I give Duran the advantage here, I think he simply brings more to the table than Pacquiao at lightweight.
Even fight IMO. Brutal war for however long it lasts, both men have the power to end the fight at any time.
Manny does better at welter. Leonard without any legs only lost by a point or two in 15 rounds. Duran couldn't handle the movement in the rematch. Pacquiao against Margo and Clottly looked unstoppable to me. Clottly didn't do much because Manny punched him into a shell. Clottly used never clam up like that. Duran would have to play a smart chess game and set traps to defeat him and i dont think he'd have the patience for that after being frustrated early.
:deal Fun fight in which Duran's fundamentals and completeness carry him through. He has good enough lateral movement to frustrate Pac's southpaw punching angle and is definitely a good enough pressure fighter to follow up on his right hand counters with explosive onslaughts. Think of a mutant Morales. Leonard flat out ran in the rematch, Duran had been sick and Pacquiao doesn't move that way. Not applicable here.
Manny isn't Leonard though. Very different dynamic and very different fighters. Even though I feel Manny is at his best at 135 and 140, I think he might have his best chance taking on Duran at 130, (or maybe even 126) where I think the Pacquiao that was starting to mature and truly come into his own might be a very stern test for the young and green sub-135 version of Duran. I think the higher you go in weight though, the mroe the advantage swings to Duran. Los Manos des Piedras is a whole other animal than Hatton, Cotto, Clottey or Margarito, despite how good Pac looked for much of those fights. Simply no comparison.
The problem I had about Duran is this. And most people know it. He never fought a legend of Pacman's level at lightweight, and he knocked out another legend. Never, unless you count Cuevas at 154 pounds 3 years after Pipino lost his title. Fact is Duran never proved at this level he could knock out another fighter. And to think Dejesus or Buchanan were as good as Manny is fantasy. I think the fight goes the distance and what would the score be. It is pickem fight to me. Manny has fast hands, and Roberto never handled speed well. It really is hard to figure, but Duran being naturally bigger than Manny I probably would edge to him. Maybe.. But it would not be this easy decision where "oh Duran would win easy" when he never beat another legend easily in his career.
All the ATG's duran fought were quite a bit bigger than him, if he had fought one his own size at lightweight do you not think he would stand a chance of getting the KO?
Pacquiao was a bit of a sniper with that straight left hand. He telegraphed it a bit, but it shot out very fast. That telegraphed motion, though. Duran was notorious for being hard to hit cleanly. Is that something he'd miss? Also, at 135, Duran possessed nearly limitless stamina. Not just punching, but pushing, prying, pulling, spinning, turning in the clinches. Alternating wrestling with short, chopping punches and wicked wound up uppercuts to the body. Manny's power is the real deal, but he isn't too good on the inside. Early war, tapers off as Manny grows weary. Duran by late T.K.O.
Duran would win and here's why. I had a young (he's 26) friend of mine who's from the philippines. Loves his boxing and of course loves Pac. I told him to watch a few videos of Duran and tell me what you think. So we watched Duran - Moore, Duran Barkley, Duran - Cuevas. And I said now let's watch Duran- Hearns where Hearns spanks him. Well he couldn't believe that the shot that ended that fight, resulted in Duran still getting to his feet. He was amazed (I hadn't even thought about it really) He was especially amazed after we watched Pac - JMM and JMM startched him with one punch. After watching him get hit by Barkley, Moore, and Hearns. He said no way would that punch have knocked down duran. I think at the end of the day, they are both come forward fighters, Pac is faster, but Duran hits harder and can certainly take a better punch, which means, Pac isn't stopping Duran, but Duran's hurting Pac. Over the course of the fight, Duran would break him down and eventually get the KO.
Pacquiao didn't fight anyone on Duran's level at any weight, and certainly not lightweight, where David Diaz was his only pit stop. And SRL was as fast as Manny with his hands, and Duran had no problem countering him. The quickness with which he shot it out is what makes it so potent IMO. Duran might get caught with it early, but he wouldn't have to worry about slipping it constantly as he'd likely move to his left with his lead hand out to parry (much like Marquez) and all of the other tactics you mentioned. Turning in the clinches, positioning himself for shots up top and to the mid section, tying up one hand, making him off balance. Pacquiao will have success circling and throwing in volume but it's a matter of time before Duran starts timing his right and following up with masterful infighting.
Ray fought Duran in the first fight and was in Duran's punching range. Sure Duran would hit him, and still he didn't knock him out. Then what happened when Ray fought his fight, yes then he was too fast for him the final two times they fought. I am not saying Pacman is as fast as Ray, but I am saying I think he might have been faster than Duran. Certainly not slower, even at lightweight.
Well here we're assuming that here Duran isn't dropping a massive amount of weight beforehand. And no matter how Ray fought in either fight, his hand-speed never left him.