"The champion with Cripple will invalidate Riven"
How can you say this when it's a weaker form of CC than currently in the game like Root, Stuns, Suppression, etc? There are so many ways to lock down mobile champions, but not often do you see a pick 'invalidated' just because one of your picks has CC. There are top laners like Renekton, Malphite, Darius etc. with CC to lock her down or other mobile champs, and nobody on the balance team thinks we need to remove Knockups, Stuns, Displacement?
I don't understand the concern here