It is no big deal though, there are 7 billion humans on Earth at the moment and more have killed a Predator. I don't see why they'd single out Dutch.
One Predator lost to Dutch and to be honest, Dutch's fight wasn't impressive. He was getting manhandled so hard until he got lucky and the Predator just so happened to be in the path of a big log intended to activate a different trap, so Dutch improvised and used the weight of the log to drop it on the Predator.
Harrigan's fight was more impressive, he wasn't being pimp slapped across the jungle and actually used the hunter's own weapons against it. Dutch would've been an easy target for City Hunter because by then that little mud trick won't work.
Dutch is a great and memorable character no doubt, my favourite Predator protagonist, but I think people are wanking him a little too much to be honest.
The movie is about the Predators and I am glad that each of the films have pretty much been self contained, focusing only on the stars of the film coming to hunt on a safari.
If they do manage to bring back Arnie for a role, more power to them. I'm not against it. But I don't think Arnie's needed, Predator does just fine on its own.
Alien made the mistake of chaining itself to Ripley and now it can't shake her off. Thankfully Ridley is trying with the prequels and is doing a good job in my opinion. To echo what someone said here months ago -
It's called A L I E N, not E L L E N.