I just don't understand how any call that can easily be proven to be wrong by replay is not reviewable. If a manager wants to use a challenge on a play, let him do it. That foul tip was obvious when you look at the replay. If I recall correctly when Len read out the umpire crew, the guy behind the plate was a call up from AAA and he clearly just missed that one. I can see limiting the number of replays if the requests were unlimited but when a manager has 1 to use, let them use it and lose it if they are wrong.