Champion Diversity

@ Riot, It awesome to see so many champions in LCS.. I have seen most of them in LCS and nice watch the Pros and see what more can be done with them.. I would like to see 2 of my most favourite in LCS in the roles i want to play them.. Rest of the champs I like playing are already getting played in LCS

1)Kayle (Mid or Top) 2)Riven (Mid or Top)

Will a meta change or what would bring them to LCS play.. Or if they have been played in those position would you let me know which game.. Thanks in advance