Apparently when OS X payload shells get a sudo command, it requires a full path (even though it clearly has $PATH defined in its env...) to that file. The updates here take that into account. Also, the script more directly catches a timeout error when the maximum time for sudoers file to change has passed.
The script now searches for the full line "ALL ALL=(ALL) NOPASSWD: ALL" written in the crontab file to ensure that it is successful rather than just "NOPASSWD". Additionally, the required argument used in the cleanup method was removed and simply turned into an instance method so it could be accessed without needing to call it with any arguments.
Brendan Coles