Why the monsterverse king Ghidorah is faster than he is said to be.

Now in the monsterverse king Ghidorah can fly at 550 knots or just shy of mach 1 but he has been confirmed to be an alien spoiler alert and the showa king Ghidorah in earths atmosphere can fly at speeds of mach 4 but in space he can fly at mach 400 so how fast could the monsterverse Ghidorah fly if he were in space with no resistance slowing him down we may never know but I do no this it was implied that monsterverse Ghidorah has been invading planets destroying all life for his benefit then moving on to the next and he was going to do the same thing to earth know in order for him to escape earth or a planet similar to earths orbit he would need to reach escape velocity which is around at least mach 30 because science. Please let me know what you think of my analysis down below.