What makes you so sure he knows how it works himself? The TOC, as far as from what I've seen here that most people believe, doesn't always reflect the ranks a series may have gotten, however the TOC is generally viewed as gauge on how well it's doing in terms of marketability for the magazine: Some of the ones with a possible better market value to the magazine will generally be further up front, those with a lesser market value to the magazine will go further back, and titles that are unranked/oneshotes/gags(<- gags seem to be the genre that are probably the most stable in terms of marketing and readers rankings) are used as buffers to space out the series in the magazine.