Yeah I'm not convinced Anderson had anything to do with Amber's disappearance. I'm so surprised the LE actually closed the case over it. They didn't find Amber's remains where Anderson said they were, that's enough reason to keep it open!
Bindner is an interesting character. As I said, I think he's just a crazy pedophile and he's like Garrido and wouldn't kill a child (but capable of other crimes). There isn't enough evidence to connect him to these crimes, and I believe the LE made a good choice to not pursue him but keep an eye on him. He just likes to mess with victims families. (In the Jay Cook/Tanya van Cuylenborg case, an unrelated person with a mental problem kept writing to the victims families, so it does happen) I do believe he knows something though, because he predicted the next child to be abducted would be 9 and then Michaela was kidnapped (unless he was making up stuff and he guessed right, which I don't think). Maybe he was sent out by the real abductors to look suspicious so the attention would be off them? I don't know, but if Michaela is being considered a victim of the SFK, then I find it hard to believe that Bindner had anything to do with these cases, as they were all thought to be related. I wonder if Bindner had a relationship with Shermantine and Herzog? It's obvious he was apart of something bigger. Maybe he helped the perpetrators bury the bodies, but I believe that would be where his involvement peaks and ends, if he even did that. Remember he was obsessed with Angela Burgay and he wasn't the perpetrator?
I also looked up about the witness seeing a girl being pushed into a car, but it says the man had a beard and Bindner did not at the time. And Bindner drives a white van, this was a tan coloured car. So I do not believe this person was Bindner and it also does not match the description.