First time I start a tread so don't flame me if it is in the wrong place.
I have an interesting opinion I'd like to share; for years I have shared the front seats on long 135 cargo charters, to come to an interesting conclusion:
It seems to me that all of the guys who are or were CFI's, II's or MEI's or MEII's, display much sharper abilities then the other aviators (or aviatrix nowadays).
While your typical commercial or Air transport pilot is still a highly trained professional (no doubt, if's or but's about it), the ones who instruct or instructed at some point appear to do a slightly better job, they just seem sharper; however slight, they are a few more seconds ahead of the airplane then the others, they don't hesitate, the decision making process is a quick one, but still thourough.
Hard to explain, really, I believe that it is the multi-tasking training that we get instructors, when we have students trying to kill us every minute that passes that brings this small sharp edge to us, but I might be kidding myself...
Anyone ever felt that sharpness from a fellow crewmember? Or if you believe in my theory, any clues as to what brings this sixth sense alive to those instructing individuals?