Ghidorah leak

^Because in both cases King Ghidorah's basic shape and silhouette was retained--This does nothing to preserve it.

The Chinese influence was also incidental in GMK. King Ghidorah's heads were based on Varan due to Fuyuki Shinada feeling he was robbed of the opportunity to create a Varan suit.

I'm 50/50 on it. The director says it's not ghidorah,all the officials say it's not ghidorah, and the video wasn't even about him. Some random dude pointed it out in the comments. Then again, directors have lied before, because the director from Star Trek lied that benidect cumberbatch wouldn't be Khan in into darkness, and if it wasn't ghidorah and instead a monster from "Lucifer" then they wouldn't take off all images from it and take the video down. If it's ghidorah or not I don't care, I'm just excited he's in it.

I think a possible "in-between" answer could be that, when Project Lucifer was scrapped, some old designs were dredged up and played around with when Studio ADI began working with Legendary Pictures on the upcoming Godzilla: King of the Monsters film.

These designs could've become early conceptual designs for King Ghidorah using assets from Project Lucifer that were ultimately phased out, as it often happens when designing things for films.

Good point.

I actually like this look, its much more intimidating with a slender look

That is not King Ghidorah. There is an entire article on this website that explains this.