About Lee Sin
If Riot wants a champ that jumps around and has Da-Plays i say reduce all of his cooldowns, make him jump even more, promote his uniqueness in that way.
But reduce his damage, make his jumping around his thing, make him do all the flashy plays he wants, make him be the one that sets up teamfights, puts people out of position and has hypermobility, he doesn't need so much damage to do that.
t.l.d.r: make him more mobile and flashy, reduce his damage.