Well this is definently interesting. Yet most the heights for the Pacific Rim monsters are wrong.
Karloff: Unknown
Onibaba: 188 feet. Chart looks like it says 185 feet, so close enough.
Hardship: Unkown
Otachi: 207 feet.
Leatherback: 267 feet.
Mutavore: 295 feet.
Tresspasser: 302 feet. Chart show 315 ft possibly when rearing up.
Knifehead: 315 feet. Chart shows 330 feet possibly when rearing up.
Raiju: 358 feet.
Scunner: 441 feet.
Slattern: 496 feet. Chart shows 392 feet. Easily taller than the Kraken. (Does not take into account Slattern can walk on its hind legs. See Pacific Rim video game for confermation.)
Sound like nitpicking, and most likely is. Don't want sound like a jerk, so I appologize if it sounds like it. It almost seems as though the creator confused height and length. Don't get me wrong, I do like the chart. It is definetly one of the better monster height comparison charts out on the web. I just think the creator should have done a bit more research first.
Information from the Pacfic Rim Wikia.