First, Freddie Kitchens most certainly did not have such a disastrous head coaching stint. This was a team that went 1-15 and 0-16 in previous seasons. In the next one, they recovered a bit to 7-8-1, but the team was 2-5-1 until Kitchens was promoted to OC. Then when he became head coach, they were a disappointing 6-10 but come on. That's what the 49ers were last year and nobody thinks Shanahan is a disaster.
Second, the problem with these "coaches are incompentent" accusations is that they are completely wild and don't make sense. OK, let's suppose Kitchens is a bad OC. Is he so bad that he doesn't understand the benefit of moving the pocket? Of designing some short, quick-hit passing plays? That is not plausible. He was a HC and OC in the NFL. He's coached in the NFL for two decades. It is impossible that he doesn't understand basics like this.
Just like it's impossible that HD doesn't understand "how to run an offense." Whatever the virtues or vices of HD's coaching, it is impossible that he doesn't understand how offense works. Impossible. He played under Dean. He played at a high level in the NBA, as an offensive minded player. He coached with Roy.
Fans need to chill the fuck out sometimes. Maybe BB won't be a good coach, but the idea that he doesn't understand basics is ridiculous and more worthy of scorn than the preseason game theory.