Topson trained with a player from Entity before the Tundra Esports match at The International 2023

Topias "Topson" Taavitsainen, the midlaner of Tundra Esports, played with players from
Entity and
LGD Gaming before the playoffs of The International 2023, despite them being competitors of his team in the championship.
Data from the DotaBuff website confirms this.
It seems that Topson accidentally ended up in matchmaking and had to practice with a potential opponent in the elimination match, Kim "Gabbi" Santos from Entity. Additionally, his team included Chen "NothingToSay" Jincheng Xian and Guo "shiro" Xuanyan from LGD Gaming.
It is quite possible that Topson deliberately chose a hero that he would not play to avoid revealing his strengths to his opponents. It is also interesting to note that his opponents included Sneyking and skiter from Tundra Esports.