New Rengar and The Hunt is On Quest

I have yet to be able to play and test out the quest between Rengar and Kha'zix, and was wondering if someone could fill me in on how the quest works if Rengar wins now that bonetooth necklace is a trinket.... Also with the fact that you don't loose stacks anymore what's the point of Kha'zix head? It's exactly the same as a fully stacked bonetooth necklace.
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