I'm brand new to this forum and finally decided to make a post here after attempting to make sense of some of this stuff myself to no avail. I've been a huge fan of S;G for quite some time, watched both anime series, and just recently finished playing the first VN. Before I really get into any of the other VNs, I wanted to make sense of a few things that I've been unable to figure out myself.
I'm not sure how active this forum is, but if any of you folk would like to chime in here with your thoughts and theories I would greatly appreciate it!
First off, I just wanted to say that my best understanding of the S;G universe is that there is one active worldline at a time, and that time loops can occur, though will always have a traceable origin (ie no bootstrap paradoxes or infinite causal loops) - I found Zeldakasumi's blog post helpful in developing some of my understanding of S;G's time travel mechanics, and will link that below.
-My first question regards the major time loop in the series - okabe seeing a bloodied kurisu, sending the first d-mail, traveling through alpha and back, killing kurisu, repeat. I was wondering how this loop would have started - would the first iteration involve Dr. Nakabachi killing kurisu and okabe still finding her body due to convergence? Is there even a start to this loop?
-The okabe that kills kurisu in chapter 1 isn't the same okabe that we follow throughout the story, is he? This is another okabe from a previous iteration, correct? The divergence numbers would seem to imply that. If so, is the okabe who kills kurisu in ch. 1 also the okabe from S;G 0 (or 0kabe, as I'll call him)? Or is 0kabe and the okabe we follow the same person up until mayuri slaps/doesn't slap him?
-Speaking of 0kabe, how is the video d-mail he sends able to be received by the okabe who makes it to the steins gate? Perhaps a better question would be, why is the message originally all messed up?
-Now I have a few questions regarding suzuha - she mentions that physical time travel causes a fluctuation in the worldline they arrive on - does this fluctuation occur when traveling both forward and backwards through time, or just when traveling forwards?
-My second suzuha question is about alpha suzuha - we see that alpha suzuha comes from the worldline where the divergence meter was originally built - 0.000000. What I don't understand is how this worldline was ever active in the first place. Is it from a previous iteration of the loop that I mentioned in my first question?
-Assuming that all the alpha suzuhas we see are all from 0.000000, then what happens to the suzuhas in the future of every alpha line - do they travel back, too? If so, where do they go?
-suzuha also mentions how her time machine comes equipped with a physical coordinate lock so she doesnt end up floating around in space when she travels back - do we ever figure out how the phonewave/time leap machine are able to avoid this problem when SERN isnt?
If anyone has any answers to these questions, I would greatly appreciate a response. Thanks!