The problem is, in order to be eligible for postseason replacement, a player must be eligible to return from the IL. That means they must have spent the minimum number of days required on their IL -- 10 for the 10-day IL, or 45 for the 45-day IL. So while we could move Rooker or Garver or Avila or anyone else to the 45-day IL now to open up a spot on the 40-man roster, we can't also use that spot to make the new player postseason eligible anymore, because it is now impossible for those guys to spend 45 days on the IL before the start of the postseason. (Since he last played on August 19, Garver wouldn't be eligible for postseason replacement on the 45-day IL until at least the second round.) So to add a single new player to the postseason roster from here on out, we may have to put Rooker on the 45-day IL to make room for the new player on the 40-man, AND petition for the new player to replace Homer Bailey as postseason eligible, because Bailey has already served 45 days on his IL stint. That means we may only get one shot to add a player in this manner. (Not sure if Gordon may also be eligible for postseason replacement?) Other factors: - putting someone on the 45-day IL now would make them ineligible for the entire postseason -- what if Garver or Avila may only miss a round or two, but we hope they can return? - once the regular season ends, you can't put a player on the 45-day IL anymore -- so we may put Rooker on there before the end of the regular season and leave our 40-man roster at 39 for some wiggle room during the postseason. If someone gets hurt in the postseason, then we could use the open spot as necessary.