You are arguing within the compounds of the narrative, not its execution. Thus I cannot answer, because its not the question that has anything to do with what I'm saying.
No, I'm talking about its execution. The execution would be problematic if it didn't fit within the context of the narrative, but it did, so I don't see the problem.
In some of Urobuchi's anime work, characters give large speeches about their ideals and role in a way that's clearly being done for the audience, and has no real in universe justification. Here, he has managed to avoid that so far. So, I just can't agree that he's treating the characters as pieces in this case. Their actions fit the context of the preestablished story, and aren't only done to set up later plots.
You seem to be conviced this is the only way for the story to handle Yuuya, but its really not.
It's the only way to handle him while keeping him as basically a footnote. Anything else would need to actually devote more time and focus on his character. But, when you get to that point, you're basically complaining about the show not doing something, rather than problems with what it actually did, and that's a slippery slope.
(A lot of good Kachidoki did, by the way. All of Yggdrasil's spotlight lasers were restored by the time Tokkyuger VS Gaim took place! So, our hero's also robbed of his small victory, too.)
The tower isn't moving anymore though, so it's probably still broken. They just fixed the exterior destruction.
Yuuya was Kouta's friend, Kouta's superior. Yuuya was meant to be the Rider that Kouta is. That his friend was not only his first kill, but a kill he was absolutely giddy about because of his new bitchin' orange samurai powers, should have WRECKED Kouta. He should have been upset, he should have been pissed. What do we get instead?
Kouta stopped everything he was attempting to do and was out of it during most of this episode, until DJ Sagara woke him up, which was already near the ending. We just didn't have to watch a bunch of flashbacks and angst about someone the viewers couldn't really care about, with the script mostly continuing the conflict between Kouta and Zangetsu from last week, about being able to fight without sacrifices.
Hase's death received a very dramatic scene, after that Kouta exploded in fury, but by the next scene, when he was meeting Ryoma, he already had recovered his self control. So, it didn't shook him nearly as much, just had more emotional/dramatic scenes since he was an actual character.