And what I'm saying is that the body doesn't have some kind of built in neurological switch that will just make sure your lats take over once traps are toast. This requires a relearning of a movement pattern...the movement pattern that ensures your lats are pulling most of the weight. You can't just force MMC. Think about trying to teach a lifter who's quad dominant how to recruit more PC on squats. If you have them do a gagillion leg extensions how successful do you think they'll be at recruiting their hammies on the squat then? They'll just cave over as soon as their quads give out before anything else.
You have to learn the movement pattern that best recruits your target muscle DESPITE the surrounding muscles also being at their strongest.
Or read the following from Dorian Yates with respect to my bis/chin ups argument...
"In my early career, I experimented with various types of grips, and I found that using a closer grip with the hands either parallel (facing each other) or fully supinated (underhand) actually provided the best contraction and most complete range of motion for the lats. Throughout my Mr. Olympia reign, I never did a single set of wide-grip chins or lat pulldowns. My two choices for vertical pulling were always a narrow underhand grip for lat pulldowns, which I would go up to 400 pounds on, and the Hammer Strength Iso-lateral pulldown machine.
A final reason to consider using a narrow grip beyond the issue of range of motion is the fact that it puts the biceps in a stronger position. Since the biceps are far smaller and weaker than the lats, putting them in a position where they are guaranteed to fail before the lats are properly stimulated, as in any wide-grip vertical pull, will cause you to shortchange your potential growth."