I saw the super preds as not being a clan so to speak but more so a group of insanely violent maniacs warped by the thrill of the kill and NOT the thrill of the hunt. I think the reason why classic was put into the film was to underscore that and without him we woulda just had a group of violent slasher like preds who hunt COMPLETELY differently than any preds we have ever seen on film before. That would have been ok I guess but I think Classic was put in for the long time fans almost like Rodriguez was letting us know that these new preds aren't the honorable type we are used to seeing which is why the predator that is familiar to us was tied up to a pike. Sure, they could have gone without including Classic all together, and while I would have been just fine with that, other fans may have hated the super preds even MORE because they dont hunt like the predator from the original movie.
THE ONLY thing I would have changed about this flick is I would have liked to see Classic actually run from the fight between he and Berzerker, take cover in the forest, and then proceed to hunt Berzerker down anytime style. But that probably woulda added an extra 10 minutes or so to the film that the studio wasn't willing to pay for in the first place.