I'm mostly just echoing what the people below already said. There are a lot of ways to connect pictures to form the same story.
I'm guessing you're hinting that we have to connect the evidence chronologically with all of the "trace his footsteps". If that's not it then can you maybe help out with how we're supposed to connect them?
A fix maybe something like different color strings for different interpretations. For example red line for chronologically time when Pete put the evidence up/got his hand on them. Blue line for connections between the evidences like Piece A, B, and C aren't discovered near each other but they all hint about a single thing.
Another fix can just be a tutorial of sort at the start, showing how the strings are suppose to be use.
Overall interesting idea for a game, just hope it is easier to understand what I am suppose to do.