I think other teams looked at him and his BB/9 ratio and said no way should we pick this guy up. The good thing about Slama is that while he has been giving up walks (because it is impossible not to), he has been keeping the damage from them under control, which is a good thing for a relief pitcher to have. If the Twins were to bring him up from AAA, they would probably drop Tyler Robertson from the 40-man, because of his struggles so far. I am not an expert when it comes to waivers and the 40-man roster, but with how well Slama is doing, to add him back onto the 40-man would involve sending him through waivers, and I would think there is a good chance that another team would grab him.