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There is no "loop"; there aren't any "run-throughs". Its just a single timeline. You are looking at it from a 3-D linear progression of causality. From the 5-D perspective, there isn't any "past" or "future". For the bulk beings, time to them is just like terrain for us that rises and falls, as Brand mentions in the movie. There isn't ever a time before they existed, and nothing they do "changes" the past from our perspective. If bulk beings are going to help you out by giving you money, there isn't any history from our perspective that ceases to be. You would just find 10 bucks in your wallet that you didn't know where it came from, rather than you not having any money, then robbing a liquor store, then someone from the future going back in time and giving you money in order to "undo" that. Cooper was always the ghost, Murph always solves gravity, and the wormhole always appears 48 years ago.Im assuming you read my spoiler. If you remove the idea of an outside agent giving the humans the means to save themselves, then the extension is that "the human race as a whole, was able to survive the present ordeal(lack of food) and naturally evolve to be a 5th dim, or with technology they became a 5th dim". Now human race can be many people, or just one people.
So the first iteration is along the lines of: bunch of people dies, no wormhole exists. Then by "x" means, "x" been a mystery, someone or more than one human became 5th, and were able to be god like. Him, she, they, looked back and in time and provided assistance by creating the wormhole and the black hole (second iteration of the loop). On this iteration Cooper finds the base by himself, probably from the drone data. Then he travels to gargantuan and all stuff happened.
It is important to understand that the movies shows the third and stable iteration loop. Where the actions of the future already happened in the past, in a matter they don't contradict the actions of the past.
I would love to read what else people thought of as "silly science". Kip Thorne advised on the movie and wrote a book on the subject which I am sure has been mentioned in this thread. While there are liberties they take, they detail them all and most instances people think of as "plot holes" aren't.