IIRC, we only see this SH 0.5. once before LoC in the beginning of TDR. Apparently it was made shortly before TDR, after the first seals broke, but a bit later disposed of in order to create another better version some time in TFoH. SH appears then in the beginning of LoC, while Moridin, whom we see the first time in ACoS, was probably transmigrated some time later.



Yeah, Moridin sneaked, as we see when he is suddenly standing "very still", when Sammael seems to have heard him. Maybe he also did something with the TP to hide noise, or fancloth doesn't only make you invisible, but also absorbs noise a bit. That the watcher is wearing a "skulker's mask" should be indication enough for any reasonable reader that sneaking/skulking is naturally involved, if someone spies on others.



What you say makes hardly sense. If Moridin & SH are a combo like Slayer, each with their own thoughts, abilities and appearance, then there is no adapting needed. Moridin would always just have his own body, but could switch to SH and they would share their thoughts.

It also makes no sense that in one scene in ACoS, SH needs fancloth as the watcher, while a few chapters later he doesn't need it anymore to spy. This indicates that we have two separate characters.

And even if you think of your vision as your "eyes", it doesn't explain how the watcher can raise his eyebrows, if a Fade's upper face is blank. The watcher also thinks e.g. of himself as a "he", while SH thinks of himself as "it". All those thoughts of the watcher make it absolutely clear that Moridin/the watcher is a human and SH is a Myrddraal.



Again, you are obviously wrong about the distance. The watcher also never said something about smell, like SH would.