Perhaps, I still think it was silly to ban items before they were properly tested though, but at this point its hard to turn back.
Also Ive tested some stuff with pika vs planking, but it becomes a pointless conversation since few would care if only one other character can handle it. Heres some stuff though, with thread linked in the description:
http://www.youtube.com/watch?v=VjmuTs6Qc6Q
the gist of it is that pika has multiple ways of canceling QA on the ledge with some options selects.
A picture of pika from one frame before invincibility and a hitbox to the next grabbing the ledge:
Granted timing is important and it definitely takes more than just that, between jolts, thunder, quick ledge release, + MKs transcendant priority, poor mobility, poor priority on aerial shuttle loop, and pikas bair slicing through many moves like side B, its still a tough task given MKs very apparent strengths. Also I think pit does a better job of stopping pikas (specificallY) anti-planking because of his multihit uair + projectile.
Its also why pikachu is OP around the ledge, but not even ESAMs bothered to learn this stuff yet since he hates QA