About Rengar's changed ability sfx

Just curious but, why did the Rengars' rework have to change the sound effects on all of his abilities? From battleroar (link posted), to missing Sfx on his Ultimate (no more roar transition while ulting, just "focus"). https://youtu.be/cfOYkBmJjEQ?t=11m39s

Been a huge fan of Rengar since release (even though started maining him around S3). He's been the only champ I cherished the most but it's still not fun not being able to hear his battle roar SFX, (its a low-mellowed type roar now).

Can a riot representative speak to me about this on why his SFX were changed? Q is understandable because of how it's now a horizontal slice n' dice type of deal (with an added forward lunge) instead of a overhead strike.

TL:DR What / who gave the reason to change Rengars Battleroar & Ultimate SFX? Would love a detailed message about the reasons / decision on why it had to be done.

Thx. Sebunsuta