@Switch BlaydeAs Laz said, no. When the competition starts, all the entrants are published (as you say, 20 so far). That takes up the entire first page. I don't know the mechanics and I said 'stickied' for simplicity. It may be that the admins just simply hold off posting non competition entries for a few days, so that all entries are given equal exposure.
My point was, that non competition stories are still being submitted during the competition and a backlog is going to develop. Once the competition has run its course, normal jogging will resume and the backlog will be posted. This could mean a rapid turnover of (non competition) stories on the first couple of pages in the week or so after the competition. Which was the point I was trying, and obviously failing, to make.
For those who prioritise exposure time, posting during and immediately after the competition is going to be a really bad idea.
I do not know the mechanics of the submission process, but my understanding is that 'exposure' time depends on the amount of stories submitted. As the site gains in popularity and more contributors, that exposure time is going to decrease. If the site is going through a submission lull, then the exposure time will correspondingly increase.
I'm sure Laz keeps an eye on things and if the problem of too much content looks to be a problem, then there are means of mitigating the situation. Like splitting off the competition into its own separate tab at the top of the main page so as not to cause a bottleneck in the normal 'New stories' tab. Also, if people are now splitting stories and deliberately posting in small chunks daily (which seems to be the case for some individuals, though this is not going to be an issue for the 'New stories' tab) to 'game' exposure, then inevitably a limit is going to be imposed on 'us' that we can only post chapters to a particular story (say) twice a week, or so. This would make the chapters longer and the 'Updates' list would contain a greater variety of writers for longer, which is in the best interest of the readers that pay the bills.
For those that like to see their name daily in the 'new stories' tab, and post 5KB stories to do so, I don't see why those stories can't be collated into one anthology post per week. Obviously that's not what the writer wants as they want to see their name in the first page every day, but it would be fairer for everyone else.