Or if the Jazz just play a really crappy game, while their opponent plays a really good game.
These kind of perfect storms happen to most teams now and then. For example, 49ers getting absolutely demolished by Seahawks a few weeks back. I don't think anyone thinks the Seahawks are that much better than 49ers, just like I don't think anyone thinks Houston is 45 points better than the Jazz. One game does not a trend make, and given how the Jazz have played at home for most of the season, I think we can reasonably conclude this was an aberration rather than evidence of a trend.
The relevant trend here, I think, is how the starters routinely suck and fall behind early in games. Sometimes the second team can bail them out, and sometimes they cannot. That to me is what is so frustrating, Corbin hasn't made any adjustments to the starting lineup but keeps sending the same guys out there to fall behind early in games. Consistency is one thing, but mule headed stubbornness is another.