I think this year they were "trying out" slightly different formats.
There was a full season this past summer, followed by ANOTHER full season this fall.
The season this past summer, the contestants were significantly more competent and the final 6 were all actually pretty good. Less drama than normal, more cooking than normal.
The season this fall, the contestants were (a) larger/fatter, (b) WAY more crazy / out there, (c) significantly less talented from the get-go. Way more drama than normal, way more "lunatic" / "throw away" contestants.
I think they were actually "testing in production" (as IT guys would say), in that they were determining which types of contestants resulted in higher ratings. Since the show is very popular now, it is unlikely to get cancelled based on one bad season. That position allows them the ability to test their theories and get paid for testing their theories at the same time.