There's a huge difference in what can be done in meditation concerning ourselfs and that which can be done to the world, nature and others. That's where the line gets drawn. Anyone who does meditation or bio-feedback knows that the mind is more powerful than we often realize.
But when we dip into the realm of our surroundings, those are forces beyond our control IMO.
And this need to make Elvis out to be anything that he was not, give him powers that he did not have, is what made his world difficult. Isn't it enough just to understand that he was a remarkable soul, person that we were fortunate to have here for a while to touch our lives? That alone is mystifing enough for me. All the other things are mere conjecture and speculation with no proof and with limited possiblities if you ask me. Like I said, dramatized, sensationalized at times, and I'm thinking never really meant to be so.
I believe that Elvis was gifted, but I do not think he or anyone around him clearly knew the extent of it. And I think the fact that he had such an impact on the world and those he touched, often made him curious about the extent of his powers. But that's all it was, experimentation into the unknown that he tinkered with. Nothing more.