Chapo's injury- the best thing that could have happened to Rosario?

Well, Rosario losing to ARguello wouldn´t change much his legacy, I think everyone considers Arguello a superior fighter.
But if we take into consideration your points about ARguello making weight, and how this affects performances all the ****ing time without we even realizing (Jofre fights against Harada comes to mind), if Rosario had a win over Arguello, we would see Rosario in a different light ! He is almost forgotten today when we think about puerto rican fighters..

 

You are right, they were going to square off "prior to Pryor" II.

I believe you may have the date mixed up. The plan was to fight Fernandez and then defend against Rosario. Fernandez was always scheduled for February (26) so there's a reasonable chance you are right on the proposed location of Arguello - Rosario.

 

So he fought Claude Noel 2 months after Fernandez.

Rosario actually fought Ramirez for Arguello's vacant title in May hmmmmmm.

Finally!!!! Here is the exact reason why the Rosario fight fell thru and when, basically. Your struggling to make the weight speculation is bang on valid. So Arguello's second warm up for Pryor ended up being Claude Noel around 140 pounds.

This is Feb 2.

'Dear Mr. President (Jose Sulaiman), this cable confirms my decision to give up the lightweight title of the World Boxing Council because I could not reach the 135-pound limit while training for the Vilomar Fernandez fight,' Arguello's telegram said.

'I have tried to lose weight but my body feels too weak to continue and reach 135 pounds,' Arguello said in his telegram.

https://www.upi.com/Archives/1983/02/15/Arguello-gives-up-his-lightweight-title/3885414133200/

 

I think the Pryor war took Arguello's prime with it. He was still fighting at a brilliant level in the first Pryor fight but being knocked unconscious for almost 4 minutes at the end of an ATG war was too much given his age and the amount of wars behind him.

 

Arguello was a little bit brittle after about '81, and not as fluid. I could see Rosario, who was very quick and precise with his punches, surprising Arguello early, but the Nicaraguan was too calm and learned for the still green Rosaio to finish off. Arguello brutalizes the body here, with Rosario's "elbows out" posture he had aiding things for Alexis.

Arguello by stoppage around the 8th or 9th.

 

Agreed. That elbows out style against a devasating 2 handed body puncher. Yikes.

I sure did not like him against Chavez for that reason and think this matchup is on par--or worse--here.