Be careful what you ask a great player to do. He might just do it. If Mr. Immelman continues to work on poor impact alignments, he may just acheive them and play his way into the broadcast booth . . .
Feel is not Real. Feel can also change from day to day or moment to moment. Alignments are always the same. Develop feel from mechanics. Beware what great players tell you what they are doing. They are tremendous athletes and can make almost anything work, at least for awhile.
You're hittin' home here, Sligo. Great stuff.
As a credentialed PGA TOUR Instructor, I can tell you that I am very aware of the responsibility. These guys are are good, and they can do anything you tell them to do.
God help the Instructor -- long term -- who tells them wrong.