Girardi has apparently been talking up Suarez as a possible starter. I'm assuming Irvin might still just start in AAA (which wouldn't rule him out for long relief).
For all the talk about this bullpen not being great, there aren't that many open jobs, assuming the injured guys are on track
Neris/Alvarez - locks
Morgan/Dominguez - locks if healthy
One of Pivetta/Velasquez
That leaves just two spots for Arano (who I think might start on the 60?), one of the new additions to the 40 and one of the minor league invites. Presumably Kelly and Liriano - I believe Kelly can't be optioned while Stock can. I also bet Liriano has an opt-out while Norris and Storen might not (just a retention bonus).
I don't really see Garcia, Hammer or Davis starting the year in MLB, and probably not Irvin either.
All subject to change with injuries or Suarez making the rotation. But I do not think this is a bad bullpen. It could be a little better but it is really all about the injuries. With a normal amount of injuries and better luck than last year we won't be seeing any kids who aren't ready or waiver-wire dreck.