LOL, the explanation is very easy- you just have to acknowledge that your premise that the US troops were the cause of the unrest was just a figment of your imagination
It's easy- the new strategy has worked in it's first objective- increased security to decrease sectarian violence
You can't explain it because you're in denial- again.
Your quote again shows that there is increased security- he then goes on to SPECULATE that it won't last
Get back to us when the civil was erupts again. Till then you'll just have to deal that you and your ilk we're completely wrong about the new strategy working