[omegant]

“ Putting this together, I suspect the Cirrus pilot never registered the presence of the Metroliner until the collision - and I doubt the Metroliner pilot saw the Cirrus even after the collision, given that he thought he had an engine failure”

This is what I think aswell. The overshoot may be either way a miss identification of the runway, or just a poorly executed turn to final of the 17R. The investigation is going to be interesting.