Miles was a great synthesist. He didn't invent many ideas, but he (usually) had a skill for discerning which ones were worth adopting and which parts had the most to offer. (I say usually because it took him a few years to get a clue about free jazz.) And when he took them in, he (1) combined them in novel way, (2) integrated them into their music and (3) made them sound GOOD.
Excellent descriptions you guys. I've mentioned this before, but it drew no comments (probably because it was interpreted as insulting by Miles fans!), but I always think of Miles in jazz as being very similar to David Bowie in rock. Both could spot the trends early, pick out the best, find excellent musicians, and put out some ear-catching music that changed the course of their genres.