am I missing something. JT Velocity is exactly the same as last year?
Yes, you are missing the actual facts...
2016 FA: 91.8
2017 FA: 91.2
And that is with the slight boost all pitchers are getting from the new measurement system this year (old numbers may now account for this though...I'm not sure).
That delta was worse earlier in the year, but he has steadily increased his velo over the year...and pitched better as a result:
http://www.fangraphs.com/pitchfxo.aspx?playerid=6797&position=P&pitch=FA&data=pi