Jordan is simply the ultimate combination of speed + size + jumping ability in one package as a basketball player.
He had the speed of a very fast 6'0 player, especially from a full stop to full go, but at 6'6 2-guard height combined with an unreal wingspan and ability to jump over/around anyone if need be.
I think he is a freak of nature completely, no one else in his family is over 5'8 so he is able to have the speed a small guy would have.
You look at his 5'8 brother Larry Jordan ... that's got to be a high 30s/40-inch range vertical leap as well ... Michael seems like he got the speed and jumping ability but got blessed with 6'6 height on top of that.
It's also why I think it's going to be a long time before you see 'another Jordan'.
Once you get over 6'3 or so you start losing speed as a player, but Jordan freakishly retained that while also getting the extra height and arm length. Cap it off with huge hands that can easily palm a basketball ...