I don't believe anyone is advocating that Astudillo be the one removed from the 40-man roster, and thereby risk being lost, to make room for Marwin. However, once the 40-man is back in balance, Astudillo is one of the choices to be sent to Rochester for the start of the season, because he does have minor league options remaining. (Jake Cave likewise, also Mitch Garver if you really like Astudillo behind the plate.) Because, at that point, you again have to deal with exposing another player to waiver claims, if you try to stash someone at Rochester but they don't have any remaining minor league options - a player has 3 for his career. You might even send someone to Rochester who you like slightly better than a guy you bring north with the big club, because you can try out both if you do it that way, otherwise you are 100% committed to the one guy if you lose the other on waivers. It's an aspect of asset management by the front office. Make sense?