I'd like to add something on the whole notion that these young Yautja are cloaking less. With the vast amounts of knowledge the Predators should have obtained by hunting Aliens for so many hundreds of years, they should have figured out that an Alien doesn't stalk using eyesight, they utilize smell. They sense the distinct odor that a Yautja gives off and uses that to detect them, making cloaking quite useless, but against humans, it grants near perfect invisibility. Even though one might argue that the shimmering gives a Yautja away to an alert human, the cloaking suit only reacts this way because the imaging computers cant keep up with the rapid movements of a Yautja, but if he ever stopped moving and remained perfectly still, you would never spot him. How cool is that!
