It's not sad. It means the model doesn't reflect reality very well right now. If the model is valid and they continue on this path they should win the division. So take solace in that.
Over the last 20 years, we've been conditioned to statistics telling us things we don't know. Well in some cases, that's true. "All things equal the data show X should be better". Well, that's not the end of the story because all things are never equal. The question is why? Kyle and others like to chalk that up to luck (variability). But luck is a black box you can put anything into. There is obviously luck involved in the equation, but how much? are there other variables at work? What are they? Can the Cubs do anything about those variables? and on and on.
When we see a stat that is supposed to model reality, and it doesn't, it doesn't mean that reality is off, it means that the model is not particularly good at what it is supposed to do. It could be because it needs more data or it could be for other reasons, but reality is never wrong.