Stewart has already conceded that this test has no real life applications. So please post your evidence to the contrary. I am open minded and would like to see it.
Some people are so open-minded that their brain has fallen out.
I think he conceded that "the skill" has no real life application, and I would concur. But the purpose of "the test" does have real life application - as it allows the DM's instructor to evaluate the DM's ability to work calmly, and methodically, through a series of tasks with another diver in order to solve a problem underwater while under a little bit of stress. I can offer no "evidence" that this is a valuable observation for an instructor to perform when evaluating a DM-C. Res Ipsa Loquitur.