It pretty much had to be Martin or Hollowell. Martin was generally the most positively viewed of the ST NRIs (along with Snider, who after a brief return to form in early ST has had his velo leave him again).
You'd prefer him come up in circumstances where he could hang out in low leverage for several weeks, but he'd be much less of a surprising breakout than Drew Pomeranz or Tyson Miller were at the time they got added to the pen.