"There are two kills that are done out of necessity. The first being the mechanic so that he can change clothes. The second being Bob, of whom he disposes quickly because Bob could potentially put up a fight. Then he admires the WAY in which Bob was killed."
The mechanic kill happens off screen. There's no way you could possibly know how this interaction unfolded. Maybe he played with the mechanic. Maybe he didn't. The point is that you're guessing. As for Bob, it's possible that he was taken out first for the reasons you gave, but this isn't implied in the film. And the head tilt is ambiguous. You say he's admiring; I say he's more like an alien making an observation. It's ambiguous.
"The rest of his victims he plays with because he loves the hunt and he loves feeling their fear."
Do you have the time stamp for the scene where the film addresses Michael's love of fear?
"This is the least playful death because this is his first."
Your conclusion doesn't necessarily follow your premise here. You're just making shit up.
"Quick death because he's done with her."
You would have to have some kind of insight into Michael's inner workings that the rest of us aren't privy to in order to make this claim. And considering Michael never talks or expresses emotion, I'd wager you don't. You're trying to inject meaning into what is essentially a walking void. He doesn't kill her because he's done with her (unless you're implying that Michael gets bored)--he just kills her and is then done with her. This applies to Lynda as well.
No issue regarding his following Laurie all day.
"The '78 Michael would never stomp a man's head in with his boot."
Really? The guy who bluntly impaled an entire human male body to a wall with just a kitchen knife? That guy wouldn't swiftly stomp someone's head in? And how would you know? You spent all of one night with the guy. If he hadn't been shot off the balcony, who are you to say what he would or would not have done, given the opportunity?
"The '78 Michael would never stab someone with fifteen knives after they're already dead because it isn't the kill and the blood and the brutality that excites him"
Did he look excited to you? He was creating a display. Just like he did in '78. He does this again with the two Jons. The Michael of Kills is the same Michael, but because the newer movies have more ground to cover with the story they're trying to tell, they've chosen to prioritize other aspects of the character. He's still stalking and being a generally weird dude (playing hide and seek in the park); it's just that we don't always see it onscreen. In other words, the character hasn't changed.