Why not, but you have to analysis if the underdog has a good real chance to pull an upset. We've seen that in Kambosos, he is not afraid of Lopez pre-fight and the way he talks, you know that something big is going to come out with that fight.
So far we haven't heard any from Butler yet, so I would say that Casimero chances to win are very high given the fact that he can knock out anyone in this division. It might be good for us bettors though to time the right round in which Casimero will knockout Butler.
The chance of winning is always on both sides, though the odds favor the defending champ, and in this case, Casimero holds the belt.
We will witness everything when the fight starts and these two fighters already showcasing their talents inside the ring.
Most of us are bias because we support Casimero in this fight, however, I agree that anything could happen, upset happen in other matches, so no exception for this match if Casimero will not show his dominance. Maybe I will just wait for more market on this fight, I just can't take the Casimero ML as it's not worth my money, Casimero by decision is probably worth if the odds will be at least 1.70.