"The cub at the end was/is a male/Kopa because the official Bücher say so!!!" NOT.
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1. Most of the official Bücher from 1994 state it's a boy, but it matters not because link is equally official and states it's a girl!
2. The official book "A Tale of Two Brothers" wherein Kopa first appears, tells a story of Rafiki arriving to Pridelands for the first time when Mufasa is already a teenager. But link is equally official and states that Rafiki had met Mufasa when Mufasa was a cub. As the last mentioned is equeally possible truth and contradicts Kopa's family history, the cub in the film is...