Uhm no there isn't. It's exactly the same.
"Garrosh orders the best of the Horde to form a new army" vs "Warcheif Garrosh Hellscream orders the best warriors of the Horde to come forward and serve in a new army" - it's the same story, your reading skills are just.... Abyssmal.
The core essense remains the exact same - Garrosh orders warriors to serve in a new army.
And yes, we have actually "cleansed" the isle of bad guys. We stopped the Sha, the Mantid, the Mogu, the Saurok and the Yaungol - there's no more baddies to be dealt with.