Of course the so-called "rebels" wouldn't want the inspectors to get to the sites, it would likely look bad for them.
The West's proxy dogs aren't getting the job done at all, which is why we have all this saber-rattling coming out of Washington/Paris/London. Assad is winning, and they can't get rid of him by proxy, so they want to intervene directly.
It makes no sense for Assad to use chemical weapons when his forces are destroying the rebels' and has been for awhile now. This is a blatant 'false-flag' that anyone should be able to see.
It would be really helpful if you could describe how Assad is winning and how his forces are destroying the rebels. Please share the details.