Ah, it's more of, if you get one, you are also taken out of the pool for the other until everyone has had a chance to get MU or SC. So, theoretically, once everyone has had one MU or SC session, you would have a second opportunity to get another. Of course, this will probably take forever since we have so many players and new people coming in every three months. XD;

Yeah, it kinda sucks... I hope the extra slots will allow people to get second chances.