No, the aggressor is he who launches the initial full scale invasion, Bruce. That was Georgia. There were undoubtedly some provocations on both sides prior to that, and no one is entirely blameless in the matter, but the Georgians are the aggressor.

They have suffered a sort of similar result (though on a much, much smaller scale) to what Saddam's Iraq suffered when it went into Kuwait...and Iraq was the undeniable aggressor in that case.

No 2 ways about it. Georgia was the undeniable aggressor in this case.