Again, steps don't matter, it's how well you move, which is determind by clean, extended lines, grace, speed, accuracy, etc... You said Michael is a good dancer for a singer, but that's absurd. Michael isn't a popper and he isn't a locker, he's just a pure dancer, he just dances and does everything. He is the purest natural talent in dance I've ever seen, for someone who hasn't ever concentrated on any one specific form, or taken classes or training, or had the time to dedicate his life to dance, Michael's the most gifted I've ever seen.
One thing that seperates Michael from other's is how quickly he picks steps up, no matter in what genre. Hand stands aren’t dancing, that's acrobatics. A better idea of what Michael looks like when he improvises is when he danced against Spike, you know, the rabbit from Moonwalker, or the steps he performed in the video for "TWYMMF" when he's chasing Tatiana, or when he danced for the skeleton sequence in "Ghosts". Michael just does steps, not necessarily popping or locking. He just moves. Shrimp is a popper and a locker, but if he had to battle Michael using jazz steps, or tap steps or just general movement, he would lose and hard because he doesn't move as well. He isn't as graceful, he isn't as fast, he isn't as clean, he isn't as accurate. His lines aren't as good. If a dance judge from "Dancing with the Stars" or "So You Think You Can Dance" were to do the judging, I guarantee that Michael would win, because they wouldn't be looking for the cool, previously unseen steps or the number of steps, they would be looking at your form. Michael has better form then Shrimp hands down, in terms of classic standards, he just has better form. And he's more versatile, he is able to adapt to any style of movement or genre of dance. I've never seen Shrimp do anything other then pop or lock. If he had to do the choreography from "Bad", or "TWYMMF", for example, he wouldn't look good at all.
And again, the thing with Usher, Michael is a better dancer then Usher, and you must see why. Usher is slow, he doesn't have any speed, and that kills any chance of being a great dancer. He doesn't even compare to Michael. Whether he's got a greater arsenal of steps doesn't matter, because he doesn't move as well. Not as accurate, not as fast, not as coordinated, not as fluid. Form is what matters, not steps. And in the definition of what dance is, in my mind, just basic motor movement of the limbs and torso from point A to point B, only a few dancers in history compare to Michael, and it isn't any street dancer.
And if we're talking about locking, just watch that clip I posted earlier in the thread of Michael and Dom Deluise. He moves faster and with more accuracy then Boogaloo Shrimp did in those clips you posted of him locking.