In the game of sports, winners are always categorized based on the team with the highest performance. For example, in English football (EPL), Arsenal Football Club and Manchester City are seen to have good tactical skills, making them stand out as winners in each of their games. Therefore, a gambler establishes trust in those teams because they have won almost 88% of their games. The gambler stakes high on each of these teams because they believe that the money invested in each team will bring out good returns.
The same thing goes for when a gambler wants to stake on players. They must know the performance of that particular player before any trust can be established. For example, Harland of Manchester City is known for goal-scoring, and Saka of Arsenal is known for good finishing. This is how trust in gambling is established, although this trust sometimes fails.
My question now is, As a gambler would you give 100% to a stake that you trust?
You cannot place 100% of your stake in the same team/event. Sometimes happens but is always a mistake.
About the first part of your topic, I think it's an issue having such approach, just because you're evaluating team on "papers" and not the real condition taking in account the complexity of tournament, player condition, opponents and more more...