Not only are you over-stating Jackson's stage moves (honestly it WAS mostly moon-walking and crotch-grabbing) you're down-playing Prince's. Prince did a lot more than "clone James Brown," but even if he did, he also did it in high heel shoes (which is how he ruined his hip). Jumping off PA risers... splits... and the occasional floor humping...
Jackson couldn't walk from Point A to Point B without his hair igniting.
Let's not rewrite history here. Jackson was immensely popular, but this is not the definition of a "musical genius." He was far from it.
His abilities didn't even approach that of Prince's, be it vocally (Prince could range from baritone to falsetto - often in the same song), musically (could MJ even play a single instrument? vs. Prince's "One Man Virtuoso Band"?).
Look at them objectively and they don't compare. Not even close. Prince was a one man producer, performer, song writer, visionary whose genius gave birth to a dozen other groups and an entire sub genre in music (the whole Minneapolis sound), while Jackson was still trying to perform 30 year old hits from the Jackson 5.
Take away Quincy Jones, Michael Peters and John Landis and you have a 50 year old has-been trying to sing falsetto. And how many of those hits did MJ write?
As a side debate, we can pit personal life vs. personal life.
While Prince was banging Kim Bassinger, Vanity, Apollonia Kotero, Sheena Easton, etc, Jackson was having "sleepovers" with Emmanuel Lewis, Cory Feldman and Macaulay Culkin.
Totally apropos of nothing, but I would be remiss if I didn't state the obvious.
In the end they both ended up in the same place, though (although I'm quite sure Jackson is in Hell), so they definitely shared the soul-crushing existence that was born of the solitude they created - mostly because both of their fathers were genuine shits. But that's a discussion for another time.