It is somewhere in the back of my mind that LE, in the interviews, even managed to extract the info from the Ramseys that they kept a flashlight in a drawer in the wet bar area on the ground floor; they were also shown a crime scene picture where that drawer was found open and empty.The R's house was close enough to others in the neighborhood that with lights on in the house that time of night, someone might have been identifiable if seen moving around the house, so it makes sense for the perp to have lights out and be using a flashlight for navigation. What are the chances an intruder would have known where to find the R's flashlight to use for that purpose, as opposed to the R's knowing exactly.
The flashlight is a definite bugaboo of a clue, but it points to the R's much more definitively than an intruder IMO.
It is extremely unlikely that in the Ramsey home with its warren of rooms, an intruder would just 'happen' to find the right drawer. ...
That flashlight was the Ramseys', no question.
I'm wavering whether they left it on the kitchen counter accidentally or intentionally to mislead LE, but tend more to it having been a purposeful act.
I think the Ramseys did use the flashlight because they didn't want to put the full lights on, and later set it up as a red herring to make LE think the "small foreign faction" had used it.