just because he's not on the NLDS roster doesn't necessarily mean he won't be on the NLCS or WS roster Ahh, didn't know you could change rosters in between series, I thought it was one set lineup for the entire postseason. I'm pretty certain it's fixed rosters for each series. Meaning, whatever the roster is for the NLDS is set, but it can be changed between the NLDS and NLCS and World Series. Only exception is injured players can be replaced within a series. Correct. I should have mentioned that. Just to clarify... If you replace a guy for injury, by rule he's finished for the remainder of the postseason.