This.
Gasser shouldn't have anything left to prove in AAA. There's Ashby. Those 2 along with Burnes, Freddy, and Miley make 5. You still have Rea and Ross. Seems pretty set for Spring Training.
You mention Rodriguez and when thinking of Ashby, I'd wonder if getting starts from him til mid-season and then inserting him in bullpen. How many innings or games started would they push on him? So in come Rodriguez mid-season to take over if you don't make a trade instead.