Tristana in quarterfinals

When watching the quarterfinals of Worlds there is one champion that really catches my attention: Tristana. This champion has a disgusting 12-1 win record (92%) at the moment (after game 3 of WE-C9) in the quarterfinals yet no1 seems to be talking much about the champion and it is not valued above any of the other adcs in the meta there (Cait, Xayah, Kog, etc). Can any1 explain to me why this champions is mostly ignored by the casters and not even that high valued usually in pick-and-ban by teams despite this win rate? This is not whining Tristana is op. I just really don't get why this champion is ignored so much despite this huge win rate in quarterfinals so far.
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