well, after last year, AM was specifically known for not caring about cosplay, so a lot of people didn't anticipate that they would care about cosplay this year.
The 2 day thing was one of those "Looks good on paper, executed poorly" things.
It was suppossed to be promoted as friday being the whole show, and saturday basically being the top class, basically, the ones who were in the running for the awards. Since saturday was so booked, they wanted a cosplay show that could be done in an hour.
Sadly, there were some problems with this, some of which (like starting 2 hours late) were completely unrelated to the cosplay staff as well. So, I dunno.