Exactly what is a 'Bridgerweight'

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sounds like another division for canelo to take over

Canelo really "took over" the light heavyweight division the way Roy Jones took over the heavyweight division.

both roy & canelo looked great in those fights

Looking good is far different from taking over a division. Beating an alphabet champion in Kov or Ruiz and then running away to not take the top champion is not dominating any division but simply cherry picking.

they can only fight one guy at a time. both roy & canelo dropped back down again to take on guys that are considered near the top of their divisions