Obama's Solicitor General never imagined that other's would find flaws in his arguments. Everyone has. Because it's not the Administration's arguments that are flawed, but the law itself. The LAW - is unconstitutional on many levels.
The surest sign your lawyer hasn't done a good job is when you issue a statement defending his performance.
The conservative justices were obviously concerned that if they left parts of the law in place, the votes would not be present in Congress to fix it. From the “Louisiana Purchase” to the “Cornhusker Kickback,”so many “venal” deals (as Justice Scalia described at least one of them) were struck to get the votes needed for final passage, “legislative inertia” would prevent remedying any problems with the law.