Board Thread:Questions and Answers/@comment-1362555-20140519102441/@comment-25511119-20141019034730

And, no one knows why ~ But, several theories are: Biggs' controversial tweets were unacceptable to Nick or they were unacceptable to Nick due to children possibly seeing the tweets ~ or Biggs didn't want to do Leo anymore due to him being on Orange Is The New Black or because of that show recording sessions couldn't be coordinated.

We really don't know why the change. At least Seth Green is always good at whatever he does. Someone in the comments above did say that Jason Biggs was fired.