I really can't go any further than to say that I believe, as most do, that there was at least one shooter behind the fence (or was it a wall? I forget) atop the the infamous grassy knoll.
I wouldn't even begin to speculate about their identities, but that's not really the important thing anyway, IMO.
What I would like to know, of course, is who they were working for.
And that, alas, is what I don't think we'll ever know for sure.
Even if the day comes when the supposedly absolutely and unequivocally 100% truthful version comes out, I'll still be wondering if it's not something that the real conspirators somehow threw out there to throw us off the track even further.