What I've said over and over again ....
Vasquez --> worn down (back to back 230 IP seasons), K rate falling, big bust candidate, fastball ineffective
Vasquez threw so many curveballs and changeups last season because his fastball lost a ton of velocity and just wasn't there at all. I highly doubt he wasn't a fastball pitcher during his 241 K ride in Montreal. That fastball failure in the second half of last season scares me, and as seen in the last half of last season, I think he was forced to become a curve and changeup pitcher, something that doesn't work for him.
Check out the sig.