If Mack were to build trains for a spinning coaster that would have inversions, I would expect them to build more heavy duty trains, such as the ones seen in the spinning Blue Fire test video.
Jeez man, a bit too much fanboying, per se? Holiday World does a fine job with their park, but they do make mistakes and not everything they do is a good decision. For instance, adding the trim brakes on Voyage earlier this year was not something that would be deemed "awesome" by Holiday World's fans as they essentially neutered what used to be one of the greatest wooden coasters of all time.