Confusing movie

Rating: 5/10 (9 May 2018)

Here how I rate looper (from lowest 0 to highest 10)
From acting: 8
From writing and directing: 5
From story logic: 2 (I don't want to give 1 because it will be too low)
Total : (8+5+2)/3 = 5
The acting is very good. Joe and Old Joe are very well played. Both BW and JGL are very good actor. The dialog and the acting are believable. Two thumbs for them.
Writing and directing done by the same person. And it was a good directing and also good writing. The dialogs are strong, the acting is strong, but the character development is not very good. We watch no major development either in BW or JGL. And think about it, how can younger version seems to have different character with older version? Maybe 30 years of difference will change people character. Maybe.
The major fallback was in the story logic. The story line is okay but how to get there is confusing.
Now let's talk about story logic. In this story, nobody explains the logic of the time travel. If somebody send back to the past what will happen to his experience
Let me put this way
Every killing should be private right? The organization in the future send future body to be executed in the past. The executioner just shoots the body, kills him/her, then burn the body, claim the silver/gold along the way. Job done. Right?
Now let me ask you a question. How can people at the same time with the executioner can tell whether or not the executioner has kills his target? How can Abe (Jeff Daniels) knows when Seth (Paul Dano) unable to close his own loop? Close loop is a term define in this movie as an action done by crime bosses who eventually need to end a looper's contract, and also eliminate any traces of their working relationship, so they send his older version back to be killed by his younger self, referred to as "closing the loop", which each looper must do himself. They're paid in gold for this, to live the rest of their lives in comfort.
The question still remain, how can Abe, that was sent back in time to manage the loopers, can quickly knows whether a looper has able to kills his target? It doesn't make sense. The movie never explains this at all
Let me put again another case which is also unexplained.
Let say person A is a looper that execute people, his timeline is T1, up to "present day" in the story. The older self, in the future experienced his timeline as T1+T1' (the original T1 is come from person A up to the "present day" in the story, then another T1' is come from person A from "present day" up to "future day" in the story). Let say, crime boss sends back the person A from "future day" to "present day" to be executed by his younger self.
The "present day" A only experience T1 in his life time, and in the other hand, the older A "already" experience T1 and also additional T1'.
If older A still have complete arm, and then suddenly A cut his arm in front of older A, logically it will not affect older A. Older A originally never experienced arm cut off, right? He is sent back through time with complete arm and just witness that his younger self cut his own arm. But the thing is, inside this story, once A doing something, it will immediately appear on older A. it doesn't make sense since older A is already there without experiencing what A is about to experience. If the writer wants to convince the audience that this is how the "story world" works, then the writer need to lay down foundation first.
The logic is never explained. Of course, it will be difficult to explain since time machine is a complex concept and story with such a complex concept must have strong fundamental theory in it. I mean the writer need to lay out the "physics" of the "story world" first so we can take anything even as absurd as human can fly. The writer need to lay out some fundamental first before the audience can be happy to accept it.
Since the logic was never explained that is why the writer can kills the "present day" A so that the "future day" A will be vanished in the thin air