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They will get to that point quicker the quicker they are facing mlb hitters regularly. Paxton and Walker seem to probably be on that side of things. So filler would push their timetable back as well as not offering much if any on field improvement. Ramirez may be in that same boat and he could be the swing man. I think that's 6 already with possibilities beyond that. One SP is all that seems prudent at this point and I think he should be a capable #2. In isolation I'm happy with Iwakuma but if three of the kids need to be in the rotation somebody has to go. If the SP acquisition was traded for they could be traded away but if they were signed they can not be traded for a year. That leaves Iwakuma or Felix so you take your pick.