If Tsurika can create that kind of explosion, I don’t get why some people assume Yuta wouldn’t be able to do something similar or even better?
Rika is literally part of Yuta’s power set. The energy Tsurika used for that explosion still came from Yuta in the end.
People talk about Rika like she’s completely separate from him, but the series constantly shows their powers are connected.
So if Tsurika was able to output that kind of destructive power while using Yuta’s cursed energy, then it’s not strange to think Yuta himself could replicate or direct that same level of power, especially when the story has always emphasized how absurd his cursed energy amount is.
What Rika literally did there was tell Tsurugi to swing his sword and say she’d “add power” to it. She amplified the attack.
So why do people assume Yuta, the actual source of that power, wouldn’t be able to do the same thing himself, or even better? If Yuta swung the sword himself, why wouldn’t he be able to pour that same power into it?