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Nobody is taking away his wins against players from the Top 20.Who doesn't have first round exits at the Champion's level other than the top Chinese? I believe there was a time when Bernie Szocs was losing first round every time at either Champions or Smash, I believe Champions. Would you say her rating was inflated?
In Bundesliga, Aruna went through two periods, when he initially got there and performed reasonably, and later when he didn't like being there. Bundesliga is a tough league, some players with good records there haven't done much on tour and vice versa.
Of course his ranking is inflated by continental points as are many players, but you will still struggle to find a player below his ranking with the quality of wins he has. I gave you the list, try to find it in players ranked below him.
But there is another list, his exits from the end of 2023, most of them at round 1: Kao, El-Belaili, Matsushima, O. Ionescu, Freitas, Matsushima, Uda, E. Ionescu, Walther, Huang.
These are all great players, but they are all way below Aruna in ranking. He wins against top players from time to time, but he had so many losses against people he was supposed to win.