Yeah it's always shitty when fighters don't make weight especially if they're not new and it's not a first offense. When there's a brutal finish involved, it's even worse due to the advantage, but ultimately, the opponent has to agree to step in there so it's part of the game I guess.
If he can continue to make weight, I'm very excited for his title reign. A smaller fighter that loves looking for the finish is the best of both worlds with activity in ring and a feeling that the fight can end at any moment.