Effectively period is quite confusing, we have a flashback where a very young Leia and William talk about celebrating a month together or something similar. Then we have a William who says to only realized he wanted Leia after losing his virginity to Monica.
- William's been gone for more than 5 years - as he's been with Miru for five years, three months and eleven days, and she is post him leaving. Whe don't know in this version if they start together in prison, or after. There will be more time than that. Leia hadn't hit puberty when William left, no breasts, it's mentioned William says they're new.
- Mon was deflowered at Kat's birthday - as Kat's still in college, and William is 24ish, that makes sense to Mon being older than kat, same age as William, Dana, Leia etc. After orgasm, William had post nut clarity and left Mon because he relaised he wanted Leia and saw no future with Mon.
- the new family dynamic only alters when Katie knew Leia and William, not when William and Leia knew each other - as they are related, there is almost no chance they would have been separated and reunited. There's the flashback where they're playing with toy dinosaurs and we first get the bibi word, which shows us the youngest that they interacted with Katie that we currently know. Then we see Dylan teaching them to fight. I can't imagine that the toy dinosaurs were when they were much older than 6. William, on to video games by the time of the flashback with Leia, so they've been in the Zane household from a young age (unless Ocean re-renders).
- The heart can be carved at any time. William has shown that he can be genuine, then 180 and be an asshole. It could be after he creampies Mon, right before he flees, having realised he needs to take Leia seriously. We don't know if William and Leia were committed from the flashback until he left, but in the monthiversary flashback, William's an asshole, so it's likely the heart was at a later point.
- William was still being chased by girls throughout highschool if I remember correctly. In the old version, at least, she directly tells Dana that William isn't interested in Dana, in this version she tells Dana that William prayed to satan to keep Dana away from jealousy vibes. So we do get a picture William was playing the field.