I'd point out that Strahm and Banks have relatively low velocity FBs.
Kerkering's success is due to his sweeper, not his velocity.
Phillies have lots of high velocity RP prospects going nowhere b/c they can't develop a plus secondary pitch they can throw for strikes.
This is why RPs often come out of nowhere, veterans rediscover a pitch that used to work (Hoffman) or a pitcher mired in the minors tries a new grip and suddenly has an "out" pitch. Whether it's a change-up, splitter, slider, sweeper, most RPs just need one plus offspeed pitch to make a big jump.
Neris is a good example, as a FB/curve pitcher he's below replacement, but when his splitter was working, he was a top RP.
Now I don't know if Teran has that pitch. We'll see.
