Why is Rengar's problem size, not albinism?

This is just a random question for Riot Story devs I have been wondering for a while: When Rengar's story was updated, why was it determined he would be exiled from his tribe for small size, rather than for albinism? Rengar is clearly an albino - he has white fur and a light blue eye, testbook signs of albinism, and neither is natural coloration for a lion. Albinism is a sign of bad luck in several cultures (see link). Especially in a tribe of hunters based on stealth, it could be reasonably argued that albino coloration, which removes a lion's natural camouflage, is just as disadvantageous as being small, perhaps even more so. And finally, the idea that Rengar is small for his tribe is a little dissonant with the character model and in-game play - part of the reason Rengar feels powerful in-game is because he is depicted in lore and in-game as significantly larger than the human characters and models, and it is cool to play a character that is fast and stealthy as well as large - it adds an element of awe to playing as him. So to me, Rengar being exiled for albinism would be just as logical and also jibe more with the experience of playing him.

I'm sure this idea occurred to the story devs who re-wrote Rengar's story back when Xayah and Rakan were released, so I was wondering if we could get the explanation for why you chose to go with size instead as Rengar's problem?