Thoughts about Hiruko's loop
So the loop was started by Takumi going back in time, meaning Hiruko in route 0 wasn't looping yet. Takumi also didnt loop in 2nd scenario (the ending, not the branch, as he knew Shion's name). So did Hiruko perhaps attempt a time travel of her own with Shion's power in one of the 46 endings we didn't see, or was she maybe pulled into the loop with Takumi because of her Special Redo, like a magnet?