Regarding that we will talk about the percentage of who has a higher chance of becoming champion in the Champions League. However, it is not automatically the case that the team that has a high percentage of chances will become champions, they need to prove themselves by playing well too. There are several teams that have a high percentage of opportunities but they ultimately fail too, let's say Leverkusen last season in the Europa League, they lost in the final round.
These are examples of different competitions, and let's take the example of the Champions League itself. Last season, Manchester City was the team with the highest percentage to become champions, but they also failed because they lost to the team with the percentage below them, Real Madrid. It only opens up opportunities, what determines is the game on the field. Whoever is better will win, don't forget other things such as mentality and luck which are sometimes determining factors.
If all predictions were accurate then there will not be any need to watch the games, and that is what makes sports interesting, however casinos are experts at calculating those odds as that is the most important part of their business, so chances are that one of the teams at the top will get the championship, however at this time the overwhelming favorite seems to be Real Madrid, and if its players can remain healthy, it is going to be a real challenge for other teams to beat them.