I reckon youre making up a new rule if you think the tackler has to have control of his opponent.
The umpires like to let these go but when you turn nearly 720 degrees before disposing of the ball you should be pinged.
There is such thing as control in a tackle. Hardly a new rule , if the tackler is scraggling at your legs , hes hardly got you holding the ball if you can get your hands free and dispose of it