LeBlanc falls off so hard late game
Banshee's Veil cancels out the combo if you need to use distortion to get close. People have GA. People move faster in general. Lots of particles and crap going that covers the screen.
If you look at my last game I was the chogath with the leblanc on my team. I don't think she killed a single person in the last 30 minutes of the match.
I think she needs a buff to her distortion late game so it deals better damage so she can just W R W and scram.