Avenger Endgame : Future of Avenger (Spoiler Alert)

Guys do not read this if you have not seen the movie yet, there are 100% spoilers, so go watch movie and comeback or proceed on your own risk.

There are lots of loop holes in the endgame, but the most of all is future nebula killing the past nebula, here I think that Nebula is more like a machine, so life and death doesn't apply, may be when future Nebula killed the past Nebula, it shut down the machine,

And like Bruce said, you cant change the past, because when you go to past your present becomes your past and not future, because you already lived it, as it is already been done, it cannot be changed, rather it goes in to multiverse with parallel universe created by time branch. Also one more fact we dont know is how thanos knows tony stark, thanos from infinity war knew thanos, but 2014 thanos must have knew tony or not that is not confimed, it would have made sense if thanos was sent back to 2014 after defeat, then it would have made sense that thano from infinity war knew tony because he did fight with him in 2014 by going in to 2023 and got defeated.

But then in infinity war he would not have let tony live after getting time stone as he promised to Dr. Strange, as tony would sabotage his plan in 2023, but like nebula said, his father can be anything but not a liar, but then thanos did killed everyone from dwarf's planet and left peter dinklage alone where he did lied, but then i think those are different thanos as in 2015 thanos said fine i will do it my self, where he wore that guantlet which he would have created after defeat of 2014 -> Future 2023 -< back to 2014 so I think Thanos of 2023 (Whose head was chopped off) would have came along from many timelines and parallel universe generated from time paradox.

May be he knew all along, he also had time stone, so would have seen almost at least billions possibilities and found that this is the only way he can get his destiny fulfilled for at least once before his death, and he choose to remain on garden to die peacefully, but 2014 thanos was yet to experience the journey, so over all I think thanos would have tried to snap his finger at least 7 times and avenger would ve gone in to past same amount of time to get it right on present day when they killed both thanos, one from 2014 and one from 2019 So in near future like DC we can see multiverse, as already spiderman has brought the concept of spider verse in the recent marvel animated movie, so its like 7 loops coming through and back and forth to current time line of 2023, but there is one more timeline being created in 2019 where thanos never existed and had 2 captain steve rogers and ghamora and black widow both alive and yes tony stark too, as the other events didn't happened after 2014 thanos died in that time line, timeline from where thanos ceased to exist.

This is where marvel will bring the new universe back in action, and might discard 2023 timeline or also mix it up altogether to multiverse coalition in future movies, marvel did manage to create this loopholes to make greater plot for future movies, which is to be having more possibilities and great storylines on larger then life cinematic multiverse