I figured I might post these charts as I make them. I regularly take the expected goal numbers that the two mentioned twitter accounts posts, and incorporate them into a spreadsheet. I do this because goal difference is by far and away the most accurate (really the only reasonable) way of evaluating performances and of making predictions for the future. And since actual numbers are influenced by luck way too much, I take the expected numbers to get a clearer view that is not confounded by lucky goals etc.
Some surprising things there, like a good start to the season by Leipzig, Köln and Frankfurt (I tipped Frankfurt to get relegated this year). Sure, they can drop in form and their GD can stagnate while others improve, but they'v elaid a good foundation for the rest of the season.
For Schalke, both their numbers are shocking. Their defending is bad, but seriously, I think the bad defense would be tolerable if they were able to create at least an average amount of chances - but they can't. They literally cannot create enough to get 1 expected goal on average. That's just appalling. They're not a team battling relegation, for them it's not about picking up points - it's all about not dropping points. And for that, you need to win. How can you do that consistently if you cannot even score one goal? Especially when your defense is leaky.
Schalke have big problems going forward, and this is usually the telltale sign of a team that will have big problems for a LONG time. Gladbach was not like this last year numbers wise (they conceded too much, but still created enough), and Dortmund was not this bad in the year before that, either. There are no quick fixes for Schalke - it's not just about finding the right balance and geling together so that your defence works, and suddenly you play well again. Because not even a stable defence is going to help them much, the way they are.
Weinzierl has to change a lot, fast. Their midfield AND their attack are not good enough. Embolo is a literal waste of space on the wing (and just not that good in general right now), Choupo-Moting is not really a winger either, and their midfield players are trying to be flashy rather than solid.