I would like to make a suggestion. I think Yahoo should not allow a Team Owner in Fantasy Baseball Pro Leagues, to have more than two Closer RPs on a team at one time. There are just enough for each team to have two on their team, and if one is not performing well or gets hurt, there is no more available as FA, since some owners have 3-4 RPs that are closers on their team. The ones that show as SP/RPs are SPs and do not close. This is crippling me, since both of my Closers have not been good, and my one Closer Rodney has been terrible. I also told my League is a Daily Lineup League and according to your rules, I should be able to pick up a player on a particular day (ex Sunday), and be able to put the added player in their Active Lineup the next day, before his game starts that day, especially if they have more than two SPs who are pitching the same day, especially to help them get more starts in the week, if they have more than two of their SPs starting in the same day, where they can only use two. I also do not like 12 Team Leagues, since you cannot get more of the All Star Players on your Team, and if you lose one of the couple or few you have to injury, especially if it is your only true Ace, you are severely handicapped for the rest of the year, and it is more fun and your able to compete better, when you have more All Star caliber players on your team.
Art Coutts commented
draft more closers at the draft and cripple your opponents
It sounds like you are in a weekly league, not a daily league.
I can tell you this won't happen. The P slots on the roster can be filled with any type of pitcher the manager wishes as can the BN spots.