I read somewhere there was a version of the ending where the main gang is killed by special forces after they land the chopper.
Maybe it would have been better for the story if it was Wolf who activated his self-destruct instead of the plane dropping the nuke.
In the current version, Wolf really doesn't help anything, he makes the situation worse by having yet another Predator ship on Earth and he is clearly overwhelmed with all the Aliens running around. His final plan of going against the Predalien with only melee weapons doesn't make much sense. It would be better if he is wounded and sees the mayhem around him, activates destruct (which takes time and also remotely detonates his ship), then drops weapons and fights the Predalien.