The top 4 spots seem locked in. Pablo, Joe, Ober, and SWR. SWR is out of options.
IMO Festa is a prime candidate for the bullpen, leaving Abel, Bradley, and Zebby to duke it out for the 5th spot. Barring injury and/or ST breakout I think it would be Bradley to start the season.
The Twins have averaged using between 8-9 starters to get through 162 so there will be opportunities for all of these guys.