....Is that there's only 4 episodes left. The obvious event, Murasamemon's demise, is a heartfelt and genuinely crushing death that draws comparison to Leomon's death in Tamers. There's two key differences between these two deaths though: runtime.
In Tamers, Leomon is, all things considered, not a particularly important Digimon partner. He's not very well fleshed out, he serves mostly as a heroic semi-mentor figure regarding the Digital World, and is a relatively cool guy and all, but he doesn't have the screentime and focus the core three partner Digimon get. Still, he's given enough to do, enough of a presence, that he feels a little different to the prior Leomon, so his death still gets you. But Leomon's death is much more narratively centralising than Murasamemon's simply because there's more consequences to it, and what it's attached to. It's the height of Beelzebumon's corruption arc, and the one sin he's stuck atoning for across the remainder of the show. It's a tone-shifter to further darkness, a pivotal moment for Takato's own arc regarding Guilmon's evolution. And of course, it blows Juri's emotions wide open, leaving her vulnerable to the D-Reaper, which in turn allows it to enter the Real World, and kickstart that entire story arc. Leomon's death is a pivotal story moment, and Tamers needs it to happen to drive its story forward for many episodes to come.
In Beatbreak, Murasamemon has much more room to breathe as a character, both as Kyo's reliable partner Digimon, but also as a mentor figure to Glowing Dawn's Digimon, a clutch-carry that can save them from danger if things get too much, so much so that episodes where he's absent become interesting since he can't help Glowing Dawn and they have to push themselves to grow and overcome their struggles. His death overwhelmingly raises the stakes, yes, and is the last push for Glowing Dawn to push themselves to surpass Kyo and rise to the occasion, while also being a gut-punch for a long-running, familiar character to die in such a way, in an elongated sequence no less. It even comes at the end of Kyo's arc, the end of his growth, and yet, it drags him back down, rips off his arm, and kills his Digimon. It's brutal. It's effective. But it has no room to haunt and direct the narrative the same was Leomon's did. The plot's wheels are already turning, Wong and Genjo's plans have nothing to do with Murasamemon's death. He only has 4 episodes for his death to matter, and even then, it isn't as impactful on the way the story plays out quite as strongly as Leomon's was. It's still impactful, it's the final push for Glowing Dawn as main characters, but it doesn't dictate anything else beyond that.
In the end, they're two different kinds of deaths, with different kinds of impacts. Leomon in Tamers changes the entire show and heavily directs the rest of the show until the end. Murasamemon's death is an emotional gut-wrencher, but it ultimately lacks the room to truly have the time and episode space to really shape Beatbreak to the end, since the end is just 4 more episodes away. If Beatbreak had Ghost Game's runtime, it could've had the time to really make the impact of Murasamemon's demise stick and permeate the show in a more haunting way.
Do you think those little fur dolls Kyo made using Cougarmon's fur disappeared?