Actually, it's not accurate at all.
1) As you said yourself, Zook is in the most precarious position of any, and it's not even close. He's been there several years and, outside of the fluke 2007 season, has massively underperformed relative to the talent of his teams. He was given the choice either to resign or fire his staff. He chose the latter, but will be following them out the door shortly.
2) Saying "Brewster hasn't brought in the talent he was supposed to" is laughable. First of all, only a select few of his players have even seen the field as starters. No one knows yet as to the depth and breadth of his recruited talent. People judging college football by the standards of pro football and/or college basketball is patently asinine, and yet so-called journalists continue to do it all the time. And people like you buy into it.
3) Brewster does not need to win 8 games to keep his job, nor does he need to win a bowl. Considering where this program was when he took over, and the daunting schedule he'll be facing, eight wins and a bowl victory this season would be worthy of a lucrative 5-year extension, at minimum. I'm not saying it can't be done, but calling it the minimum benchmark for retention is so ridiculous I don't even know where to start. Has this assclown even looked at the 2010 schedule?