Uhh, you're lashing out why exactly? Not once did I point fingers your way Bocchi, lest you count the joke of 'omg how many people are you', and now I'm (among others) the one getting slandered? How very kind of you.
I said basically naught of Belphe and Desare because outside of the alt issue people frown on there isn't anything concrete. For all I know Belphe could have been yet another akatsuki person and after seeing Desare went 'oh hey here's another of the beasts', easily too because he didn't make himself into a jinch. Or well then he just was an individual whose ass Desare kicked.
Debatable to some people no doubt, I will admit it doesn't quite sit entirely right with me either, but if dismissing the alt issue and looking at it from purely IC pov then at least I could see either of those things having happened, and that already makes two at least generally acceptable legit IC reasons.
So uhh, I don't mean to be an ass, but I would advise minding what you say a bit more. Insisting trying to put some more RP into things through at least slight IC sense into this matter is plain stupid, yet then demanding all others should just shut up, stop whining and RP, could be viewed as rather hypocritical.
But to get back on topic, as for Night, no offense to the guy but I'm not really seeing much if any IC sense there instead whatsoever. Sure he could have been just an akatsuki spy at kumo and so on, but lets assume he wasn't for a moment, like he claimed. He had a good job as ANBU captain, wasn't trusted much but not doubted so much he wasn't be given a chance instead of capture/kill-on-sight, he even had a soon to be quite rad house to live with Rinoa in.
What does he do? Just leaves all of that behind, even the close to impossible experiments he just started, without a word or any kind of explanation to anyone. Most likely suicided in giving away the beast too, since he was a jinch. While kumo higher-ups might call it predictable due to not trusting him in the first place, I'd imagine at least Rinoa feeling pretty damn pissed/betrayed over it, especially after some of the things he told her.
That right there in turn, would be an example of not at all legit IC reason.
Hell, even Shadow's thing makes some slight sense. Knowing him, could have been he had been already bored of hosting or for some other reason been wanting to get rid of it instead, orrr he just felt like rather giving it away instead of risking his life fighting for it. Several possibilities right there.
Further on Shadow, the list of 3 isn't looking all that bad. Combining ours and Kay's, could make it into say uhh, if one has already planned some kind of giveaway of the beast, and have a legit reason for doing it too, then they do as she said and state it beforehand, instead of blindsiding others with it.
Edit: Don't care what people say, I liked the movie version of I, Robot too.