Wrong.
1) first of all, the Constitution is a division of jurisdiction, NOT at all a source of rights in any way.
Second is that the Constitution includes all under US jurisdiction, not just citizens. It is about inherent individual rights, not privileges granted to citizens.
2) you have to already have legal authority in order to be able to write up a constitution. So it can not possibly be the source of any legal authority. Any dictator can write up a constitution. Does that mean is reign of terror is legal? Of course not.
3) the Declaration of Independence is a statement of where all legal authority comes from, which is individual inherent rights. And it says that when any government violates those inherent rights, the people are legally authorized by the defense of their own inherent rights, to destroy that government that is abusing them. That is a basic definition of the source of all legal authority. After all, you must first have a source of legal authority if you are going to destroy one government and create another.
4) I agree with. The federal constitution creates, empowers, and delineates jurisdiction of the federal government. But clearly we have totally violated the Constitution with things like federal gun laws, federal drug laws, federal medical laws, etc. These things were NOT intended by the founders. It is not like FCC or FAA which the Founders simply had not thought of. The BATF, DEA, FDA, etc., were known to the Founders and rejected as evil.