All I've ever noticed is that sometimes the ADS snap works and other times it doesn't. When it doesn't work my connection is a bit slow - I know this because I kill people and they shoot me after they are dead and falling to the ground. When the connection is normal speed the ADS works great and I don't die as much.
Oh, technically speaking - it's not 100% theory. It's 100% hypothesis. Come on man, know your scientific terms!