Yesavage might be on the roster day 1
Threw 35 P on Monday. Probably time for two more turns. One this weekend, whether that's in an actual grapefruit league game or not, and the another around March 26th, that's probably some simulated or minor league thing again.
He would be stretched out to over 50 P at that point and in line to pitch March 31st at home against Colorado. Maybe he just takes his regular turn, but it's abbreviated piggy back stuff for a few weeks, with Lauer or Scherzer coming out of the pen? And then after the first 7 games there are 4 off days in April so lots of flexibility to do whatever, maybe skip him completely one time.