I think fans in general think way too complicated when it comes to marketing. You know how it will go? They show some violence, some guns and a cool as shit looking Predator= Fans gonna be there by default.
The rest of the trailer (Spaceships, the kid, money shots) is either for the general audience or Shane Black fans, who normally don't give a damn about Predator and only watch it for him... or the "hot as shit" looking cast (i don't make this up, look on social media, there is a ton of chicks waiting for this movie just for Boyd Holbrook).