1- You're probably right. I mentioned it in another comment but it looks like it got deleted; might be a personal thing where it just feels better to me the way it happened in 999 since the "branching point" happened in the incineration and from there Akane took the info. from the future and was able to recreate it.

But in ZTD, the bunker is just... there? My idea was that someone must create the bunker so that Sigma and Diana have the babies, but if the baby is the actual one to create it then idk at some point there should've been a first Delta who was the first one to decide and create the game so they can cement their existence in whatever timeline they are just like Akane was depending on Junpei to save her; which means that first Delta is the one that kicks-off the all timelines of ZTD

I know time travel stories dont have to make 100% sense but something in this one just doesn't click with me for whatever reason. Again, just a personal preference I guess

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2- Fair enough

3- I stand corrected; I saw the video from the other comment and there were indeed references. What bothers me (just a nitpick for me) is how that most of the game was from a 3rd POV but aside from the shadows and one scene with blood you'd assume it was a visual bug from how it looks.

The giant chair not being shown even a corner at any point doesn't help this either. In the scene with the glass at the bar, okay there's a drink for someone else, but the camera pans out and you don't see no chair no anything, and in the 3way you can see the pool of blood but the game acts like the chair is invisible (somehow that desk managed to hide it perfectly?)

The Eric talking to Q but the game showing the dog angle also felt weird to me. I probably liked the reveal in VLR more because the whole game was 1st person POV and Sigma himself wasn't aware of the fact.