Evolve is a different ball game, it has to have separate classes for each player due to how the game is played, sure you can compare them but the 2 games are too different to have that implemented, Evolve has 12 different playstyles, 1 for each character, some are very similar but they all have different weapons and such which forces a team to co-orrdinate properly. PHG has few classes, characters, weapons etc, it wouldn’t work IMO, but a few changes to certain classes will result in more different playstyles.
But there is one aspect of Evolve which could be implemented and I believe it would work well for Predators, adding special creatures to maps which give a Predator a bit of hp and a temporary buff for example killing a jaguar and eating it would give you a Silent buff meaning you make no sound or clicks while around the fireteam etc.