The bookies are giving quite reasonable odds due to Madrid inconsistency this season. To be honest Madrid stability is still far from expectations. The attacking trio has not given a strong aura of familiarity. Not only is Madrid defense fragile, Arsenal will also benefit if they can provoke Vinicius emotions later on the field and will disrupt Ancelotti game strategy.
If arsenal can be able to hold back vinicius and mbappe then they can maybe upset at the attack since Saka is back arsenal can be able to utilize their attacking force and the defensive error that have been befallen the Real Madrid back but the thing is that Madrid can be a totally different team when it comes to the champions league and they have proven it times without number.
These are the characteristics of Real Madrid where they are different for champions league matches even though in LaLiga they are still in doubt because they can still lose to underdog teams.
Even if Arsenal are able to tighten Vinicius and Mbappe but never underestimate players like Bellingham who are always there in any position, don't give Valverde a shot because the man always scores from a distance.