Cornish Jack
To be fair, even on a visual approach, the Metro pilot would probably be looking ahead to watch for possible runway incursions once established on final - not to mention, you know, having to keep your eyes on the runway as you're literally using it to guide your descent. I doubt anyone would be doing a full traffic scan that late in the approach, and he might not have seen him anyway. It's really not easy to spot someone coming towards you at a 90 degree angle. Furthermore, Key Lime is a pretty harsh single pilot IFR operation and there is a good chance the pilot might have been pretty cooked by that time - again, traffic cutting him off from the right would have been the last thing on his mind.
Thank God.
The flying you-know-what might not be the most forgiving of aircraft, but at least it's solid.