90 meters is impossible, i would say knifehead is about 60 meters max., if you remeber when raiju and scunner appeared, some one said they where like 40 meters what i dont believe at all. All kaijus except slattern are smaller than 90's goji
People who deny valid canon information just because it goes against what they think (which is often completely unfounded, false, and biased) always give me laughs. Gypsy Danger was 240 ft tall. Knifehead was 300. He was designed to be a vicious, melee-focused powerhouse who could soke up lots of damage while mantaining a good deal of speed. Just because he's bigger than godzilla doesnt mean the two couldnt fight.
Godzilla my be oneupped in melee this time around but he's still got ray-breath, better endurance/regen, and probably superior intelligence. Well... IDK. The Kaiju in PR have weird minds.
And millenium Godzilla is my favorite incarnation of king-kaiju.