It worked in the 50s and early 60s it..... backfired and only hurt after the Beatles hit and music changed-it just isolated Elvis even more from the direction of music and rock.
The"mystique" became the "mistake" ......
the "mystery" became,
"Why is the Col afraid of to let Elvis jump into the 60s rock revolution and change with it?"
Parker rethinking his "antiquated approach" to managing Elvis such as awards show appearances, once a year events with Elvis involved-would have been a good start.