fall into the PM category. The Hulks, mostly as a class, mind you, tend to have pretty high end durability, high end healing speed, high end strength, uncanny throwing accuracy. They lack top end speed, as even the Asgardian Thialfi and many of the classic running speed types like Speed Demon, Quicksilver all run way faster than the Hulks, and many that fly can fly faster than Hulk can either run or jump. Since Hulks can't fly, can't breath in space, and have other very real limitations, they just don't qualify for Herald, with but 4 exceptions.

Maestro, War Hulk (Apocalypse enhanced), WWHulk, & Red Hulk all demonstrate abilities FAR Above most of the other Hulks. Their healing factors are higher, strength are all higher, everything seem to be operating on a higher level than the rest of the Hulks. Which is why I classify them at varying Herald levels. Red Hulk being what I feel will probably turn out to be at least a Teambuster or Skyfather level after he's more fully explored.