If they both came in at 140, it would be within the limits of both divisions; but they should only be able to fight for one title or the other (to be determined in the negotiations), not both at once, because if the contract specified a maximum limit of 147, it wouldn't be a valid Jnr Welterweight fight even if they both weighed in at 140; whereas if the contract specified a maximum of 140, it wouldn't be a valid Welterweight title fight under the normal rules of boxing. So they would have to decide in advance which title should be on the line.
So, for example, when Henry Armstrong was already Welterweight champion, he fought world Lightweight champion Lou Ambers. That fight was for Ambers' Lightweight title, but they could have chosen to make it for Armstrong's Welterweight title instead. But both titles couldn't be on the line simultaneously. Armstrong wanted to make history, hence he chose to make the fight for the Lightweight title and not the Welterweight title, but he could have done either.
People have fought for titles in two divisions simultaneously before (Ray Leonard vs. Donnie Lalonde) but it was bull**** when it happened - and it happened with the agreement of both fighters.
So, for example, when Henry Armstrong was already Welterweight champion, he fought world Lightweight champion Lou Ambers. That fight was for Ambers' Lightweight title, but they could have chosen to make it for Armstrong's Welterweight title instead. But both titles couldn't be on the line simultaneously. Armstrong wanted to make history, hence he chose to make the fight for the Lightweight title and not the Welterweight title, but he could have done either.
People have fought for titles in two divisions simultaneously before (Ray Leonard vs. Donnie Lalonde) but it was bull**** when it happened - and it happened with the agreement of both fighters.
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