As much as I don't like the idea, let's work with it.
The title "The Predator" is confirmed to make sense, and in light of this prequel this can make sense like this:
The "good" Predator is trying to stop the rogue one. In the original movie, when Dutch makes his battle call, we see a Predator cleaning a skull he's making for trophy. He hears Dutch and gets ready to fight. There's a scene where he's jumping from branch to branch hurrying to the location.
But all of a sudden we see him cloaked behind Dutch. This can make sense if this is not the Predator we saw moving quickly through the trees. This was the good Predator looking for the rogue one. He's investigating the area when he gets attacked. Of course he assumes this is the rogue Predator attacking him so he starts wreaking havoc everywhere. He can't see him just like he wouldn't see a cloaked Predator. After a while of fighting, he finally sees it wasn't Predator but Dutch. That scene where he examines Dutch's head makes sense in this, cause he can't believe his eyes it's not a fellow Predator but a human being.
Now I don't know how far the title "good" Predator gets him, cause he wants to kill Dutch. Either because he was injured by him and pissed him off or because he just can't resist it. Dutch kills this Predator (but why is he laughing like Billy?) but the real rogue Predator is still out there.
And the rogue Predator that killed everyone else in the movie is still out there, hence The Predator.
The 2018. movie could literally start with The Predator destroying the chopper, killing Dutch in it.
But the whole premise makes no sense. Why does the good Predator have the same trophies the rogue one has? Why is he laughing like Billy?
The premise of the novel says the good one stopped the rogue one (I assume he killed him), but that makes even less sense.
I don't like this idea and it's maybe a fun "what if" scenario for fun, but it seems like they're making this official and The Predator will probably follow it then. I hope it doesn't. I hope they scrap the whole idea because this is ruining the original movie. You'll never be able to look at it from the same perspective again. You won't feel the satisfaction of Dutch finally getting rid of the Predator after he killed his whole team.
Don't ruin the greatest movie of all time.