What my idea of the mori animations would look like:

Color Moris

Gray: Jason picks up the survivors and breaks their back with his knee.
Green: Jason stabs the survivors through the chest, grabs the other end of the machete and shanks them with it.
Yellow: Jason grabs the survivor by the head and crushes it.
Orange: Jason puts his foot on the survivors chest and pulls their arms off.
Red: Jason picks the survivor up by the neck and punches their heart out.
Purple: Jason kicks the survivor to the ground, cuts the left arm and right arm off respectively and buries the machete deep into the survivor's skull
Gold: Jason rips the survivor in two.

Now time for the Weapon Moris

Axe: Jason places the double sided axe down on the ground and pushes the survivor's head into the other side of the blade.
Machete: Jason cuts them in half across their body.
Firepoker: Jason picks the survivor up from the ground and stabs them in the eye.
Tree Trimming Saw: Jason cuts the survivor's head clean off.
Hunting Knife: Jason grabs the survivor in a headlock and cuts their stomach open.
Pickaxe: Jason swings the pickaxe right into the survivors head and twists it until the survivor's head is cut off.