Pacquiao won the lineal title by beating Timothy Bradley after Floyd Mayweather retired. He then vacated it by retiring after he beat Jessie Vargas. He returned and fought Horn, but because Pacquiao had previously retired he was not recognized as the lineal champion, and nor was Horn when he got the decision. Nor was Floyd Mayweather still recognized as the lineal champion when he came back to fight McGregor.
If you retire or leave the weight class for an extended period of time, you're not the lineal champion anymore. The championship becomes vacant and can only be awarded when a consensus #1 versus #2 fight happens.
If you retire or leave the weight class for an extended period of time, you're not the lineal champion anymore. The championship becomes vacant and can only be awarded when a consensus #1 versus #2 fight happens.
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