This is true and supported by the State's ridiculous array of charges; i.e., murder one but not murder two, then aggravated child abuse and manslaughter. The prosecution's own set of charges reveals that they do not feel that they have the required highly reliable evidence to prove there was a murder, much less murder one.
You are entitled to your opinion but I believe you misconstrue the wording of the law as written as well as the definition of the charges at hand. The detail of the explanations and definitions are too extensive for me to post here. But in essence, the charge(s) are not duplicating nor do they fall under the "double jeopardy" clause.
Sometimes in order to commit a certain crime, another crime has to have been committed in order to facilitate the commission of the other included crime. One example...manslaughter/murder of caylee. By pure definition and willful act, you had to have committed child abuse if she subsequently ended up dead. You cant say well she killed her, but she didn't abuse her. That is insane to say the least.
If you want links to the legal definitions and terminology of the corresponding penal law...let me know
JMHO