question about the ending of part 6

i know a lot of people ask stuff anout the ending of pt6 i just finished the anime and went to reddit to find answers to my questions most of them are answered but i still wanna check them cuz i want to know if i got them all correct and still have a few questions.

1. if dying of pucci ended the curse of joestars does that mean dio also didn't exist in the universe that created?
2. if the new universe is the same as pt6 universe but without pucci did weather still got raised with his fake mom and fell in love with his sister or he just got raised with his sister normally since the abduction of him wasnt an influence of pucci
3. why didnt pucci know everything that was gonna happen when he and emporio was in the prison again and what was gonna happen if he managed to kill emporio was he just gonna keep fast forwarding forever or was it like he needs to go all the way around 1 time to see what is going to happen and then he will just keep living in the universes after that one and knowing what is going to happen till infinity
4. if the new universe that got created was the same universe but without pucci doesnt that mean other jojos like giorno and josuke are the same in the new universe since they didnt even met pucci

im a very curious person i may come back here if i have more stupid questions