Thoughts on the past Jim theory
The more I think about The post on past Jim coming to Ethan, The more I think it is correct.
People argued about if Julie borrowed past Jim to come talk to Ethan, Then he wouldn't have been at the trailer then if he had know about it.
First Julie didn't know when her Dad died just that he did. For all current Julie knows is he wasn't home at night and the next morning he was dead. So she could tell him when or where just that he would die. For all Jim knew that his death would be a night. So he had no reason to fear being at the trailer during the day. When Julie did run up to him. He didn't seem to be shocked about her hair, She ran up and said "I think this is when it happens" Suggesting he may have already known what "This" she was refering too.
Also the story says Jim dies by the MIY, that doesn't necessarily mean that the exact way the MIY kills him will be the same.
So if future Julie is able to return and tell Jim exactly when and where, That could have happened later then the current point, This could explain why Jim's wounds changed and the location of where he was found.
The Jim found in the barn had his chest ripped out not his throat.
Jim always had to die that day, No matter if Julie is able to warn him and he went to the barn instead of the RV thinking he may be safer there.
This is going to prove to Julie that no matter what she does to stop him from dying, He will die on that day because that is what the story has already writen in.