To me it would matter though. If Yorinobu's ideas make sense, maybe we should even side with him?
But the original post was not about why Yorinobu killed Saburo, but about why the corp isn't looking for Saburo's killer or their super-advanced piece of technology. Even NetWatch and VBs don't seem to care about it anymore -- Alt and the Blackwall suddenly became unimportant for them, till it's time for V to find them. Would've made more sense vice versa: everyone else looking for V (let's say that if V wasn't dying, they could just forget about the heist and live happily ever after, unrecognized and not being looked for. That's rubbish!).
Then, re: the previous post:
1) SK is important. You might want to know if V, the protagonist, is an engram in the body or an unaffected being. Likewise, you might want to know if Johnny's engram is the only one of a kind or not cause this can change your attitude to him. He's a coprotagonist, so why not. Also, Arasaka's ending: why can't they use SK on V AND let V go back to Earth if that's a copy? Why is it possible for braindancers and politicians but not V?
2) Knowing if Johnny is an angry bot or an angry human can also determine your attitude to him. Again, he's a coprotagonist - he's worth it.
Also, lots of this thread is about arguing how human Alt is and would she be prone to lying, so yes, it matters.
I agree that they could have made a plotline delving more into Arasaka politics, but that wasn't the plot of the story, so telling you would mess up their plot.
The Corp isn't looking for V because Yorinobu has no interest in V.
He also doesn't care much about relic, he was trying to get it away from Arasaka, He'd likely be happy if it ceased to exist. If he valued it, he wouldn't be giving it away for Intel.
Netwatch has no clue what happened to relic, probably figures Evelyn's plan got botched, And yorinobu no longer needs Intel against arasaka now that he runs it.
Vodooboy Leadership in charge of the relic/alt plan got captured by netwatch, They did still want it, but they had no knowledge where or who had it, then they got trapped. VDBs were in crisis mode when V finds them. Their netrunner braintrust was trapped and dying.
As far as the soulkilller stuff, this isn't really answered by the technology, its always left up to the reader/player to decide if an engram is a human, or real.
You are right, they can probably send V's body down after. This implies a couple of possibilities
1)they are sending Vs body away after, but that V will die.
2)they will cryostasis V's body after SKing him
3)the version of SK they sell/use for these guys is inferior to the ones that wipe you.
there was an email somewhere talking about the % accuracy/success rate with celeb engrams, but I don't remember the implications, other than some engrams are failed copies.
but, I think the main difference is the player perspective follows the engram if they choose this path.