1) I was under the assumption that the mystery judge started judging later. This probably isn't the case
2) Being known would put the judge under a bit more pressure to work, and also would give people a better idea of how far along the judging is going.
Basically it would've been easier if the number of judges were kept low (it started at either two or one and i don't think FP mentioned there being any more) and the progress being made could be made public. That way people aren't left waiting because of something that happened like in the case of the kaizo level collaboration.
This happened right before I left the site for a while but basically the guy in charge, his hard drive wiped itself and he didnt have a backup. As a result the collaboration wa kept on hold until he explained what happened (which took a fairly long time)