Per the above, the sudden drop in popularity is the source. This happens all the time. For me, I'm a little perplexed because the anime seemed to be doing so well. Ah... Spoiler The discussions completely died off here, so I have to assume the same thing was happening in Japan so that's where the popularity went to crap. Just like any other series, the mangaka have a solid outline. It wouldn't be believable and enjoyable if not. The mastery is when they can fill in the missing parts smoothly. For Shokugeki, it seems in hindsight that the food/dish research couldn't keep up so they had to start prolonging/delaying the chapters. Shokugeki is probably similar to One Piece, Bleach, Naruto, etc. in that the popularity allows for "expansion" of the original plan. Oda is the only exception I've come across where his expansion is still 100% believable and connected. Everyone else, falls on their face eventually. Oda already fell on his face, but that is of his own choosing/his own admission of changing things.