During explaining guy below the plot of Echo, I couldn't believe it might be true, but it looks like it is :|
massive spoilers below
You are only moving in circles:
Sam killed Jack and escaped judgement -> Mr. Bronson killed Sam and no one found out -> during fight between Sydney and his father Syd accidentally killed him, guess what, yea... -> Chase killed Sydney and never told anyone
heh, this is not the end! There was always someone who knew what happened with the dead one:
Sam always reveal his sin to guy who we decide to play with
Mr. Bronson was with Janice
Sydney told Flynn what he did
TJ witnessed Chase's murder
omg it broke me... so many loops, so many circles it all make sense now why I did it to myself ;-;