To be fair, Real Madrid is still the winner, and on top of that winner team they also added Mbappe, so I understand why people may think that they are the best and they will win.
Plus, if any other team ended up being great then that is one thing, but Real Madrid plays specifically for this tournament, their entire team effort goes to winning UCL, they won it so much, more than double the next team, so they will do very well and probably win. I am not saying it is 100% guaranteed for them to win it, but 60% is definitely reasonable. There is a good chance that they could, but it still means 40% they will lose, so it is not like something that is guaranteed. I feel like they should just let this team be as great as possible and stop doubting their talent.