I think the big determining factor will be how they view the "Failed Starters." Which one(s) are SP depth, which long relief, which optimized towards short relief?
As you've written previously Smyly and Wesneski you don't have to squint very hard to see being very successful in short relief. Assad doesn't have the money pitch or two of those other two guys, but also was easily the most effective of the three in MLB last year, regardless of role.
I expect Craig to carry only one long reliever, with one of Assad/Wesneski at Iowa in the rotation in case of injury, and one of Wesneski/Smyly to be tried out as a standard one inning reliever. I'm guessing long relief for Assad, Iowa rotation for Wesneski, and short relief for Smyly, but wouldn't be shocked in any direction.
I also think there are two potential personnel moves that would shake things up a bit. First, and TT's written about this before, but I wonder if Leiter's name should be written more in pencil rather than pen a la Rowan Wick last spring. He is a batting practice pitcher if that splitter is not working, so I think he is very much needing to earn his roster spot this spring. I also think there's likely another addition on the way. There's been enough smoke around additional pitching depth, that in my mind it's gone from a possibility to an expectation. It is interesting that there's been smoke around both regular relief and additional swing men. But I suspect another setup type is more likely, let's say Ryne Stanek just to put a name to it
Ultimately I'd guess we end up with this
CL - Alzolay
SU - Merryweather, Neris, Stanek
MR - Smyly, Almonte, Leiter
LR - Assad
Iowa - Wesneski, Little, Cuas, Palencia, others
I think swapping Wesneski in for Assad, cutting Leiter, foregoing the dedicated long relief spot, and foregoing the external acquisition, in that order, are the most likely deviations from the above. I think the Iowa guys, in the order I have them, are the most likely to backfill.