Would you consider Pac's KO loss to Marquez to be career ending under most circumstances?

Duran against Hearns
Fullmer against Robinson were pretty brutal.

 

Charles against Marciano the second time around was a clear indicator to retire

 

Starling against Molinares
Very next fight, He beat Honeyghan for the wbc & lineal welterweight belt

 

I don't think knockouts like that are career enders. Most careers don't end like that, they end more with sustained beatings. It is amazing how Pacman kept fighting and Marquez is the one who stopped and Manny always fought better guys than Marquez. It really didn't stop Manny at all. That shows how tough he is mentally. Terry Norris with Jackson. Or Hearns with Barkley. They kept going. And Duran was stopped by Hearns, but that was not a one punch knockout.. But Duran fought another 35 times. Knockouts happen. When a fighter should retire is when they keep getting beaten up easily by lesser and lesser opponents.

 

Not at all.. That happens when you want to fight the best and be the best which he has proven from 112(105 actually) all the way up. You are going to lose some. Pac is a rarity amongst the mid 90's fighters and forward … Activity, fighting the best, and his accomplishments speak for themselves … I cried the day he announced he was getting into Politics and his life continued to spiral out of control fast.... Pac has earned the right to be put in other era's, and there are very few other fighters that do

 

No.

A lot of fighters have recovered well from one punch KOs. The career enders are the extended beatings.