That's the game of football. Many sports commentators consider Paris Saint-Germain, with its squad featuring Messi and Neymar, to be among the most serious contenders for the Champions League title. And let's not forget that Mbappé was also on that team. While such a strong Paris Saint-Germain couldn't win the Champions League title, the first year Mbappé left the team, when everyone expected a decline in performance, Paris Saint-Germain won the Champions League. That's why I love the UCL. It's truly difficult to predict.
When Mbappé arrived at Real Madrid, the squad was one of the best in the world. There was Bellingham, Vinicius, Mbappé, Rodrygo, Valverde and many more, but Real Madrid failed to win the Champions League. So, I agree with you - sometimes it's not about the depth of the squad, but also how the players respond and how hard everyone works.
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Let me tell you something more. We think that big players have the main impact, but honestly for me the player's behavior is everything, whether he was a lay player or a star player. like if the player of a team is doing the team play not a individual or self progress then probably their team would succeed, and on the other hand if a team have star players and everyone is struggling for their own individual performance then obviously then would be failed. i.e PSG.
When Messi, Neymar and Killyan Mbappe was at PSG, everyone was arguing that PSG will win the UCL but the fact is that they failed to win because Killyan Mbappe was selfish player and all the time he only prefers his own individual performance.....