I don't agree with such a precipitous drop either, but there is certainly reason to think the team could regress a not-insignificant amount this year.
We added one TOR SP and lost another for an indeterminate period of time, and we lost our elite closer and replaced him with a guy in his mid-30s who has been up and down in recent years. Other than that, the team is more or less the same.
That's not exactly what I would call a "notable upgrade" over last year's roster, but YMMV.