This isn't quite right. CS doesn't have a hurtbox. If the CS hitbox collides with any hitbox that does within 9% damage they clank. This isn't many moves for a fresh CS. As you stale CS the number of moves gets bigger.
The number of moves that clank with a full CS, even fresh, is disappointingly high, I find.
If we're talking about JUST projectiles, it clanks with:
Bowser Jr - Mechakoopa, Charged Cannonball
Duck Hunt - Clay Pigeon, Gunman
Link and Toon Link - Bombs
Pac-man - All fruit, Power Pellet from his side b (seriously wtf)
Lucas - PK Fire
Samus, Wii Fit, Lucario and Mewtwo - Charged projectiles
Olimar - All Pikmin except yellow
Villager - Lloid Rocket
Wario - Bike
Sheik - Grenade before it explodes
It gets blocked by (sends them back, but CS is still taken out):
Duck Hunt - Trick Shot cans
Dedede - Gordos
Wii Fit - Soccer Ball
It flat out loses to:
ROB - Grounded Gyro (regardless of charge level)
Ness - PK Fire
Olimar - Yellow Pikmin
And that's when it's fresh! And that's JUST projectiles! It also clanks with many smash attacks, and some strong normal attacks (any moves that do 16% damage or more in one hit).
In addition...
It can be nullified by:
Rosalina, Ryu (Rosa and Ryu just absorb it), Pit, Dark Pit (Pit and Dark Pit reflect it upwards), Ness, Lucas (Ness and Lucas regain health), Link, Toon Link (The Links simply block it)
It can be reflected back at you by:
Mario, Dr Mario, Fox, Falco, Pit, Dark Pit, Ness, Lucas, Zelda, Mewtwo, Palutena, ROB, Villager (a pocketed CS will 1-shot break your shield)
It can be be countered by:
Little Mac, Marth, Lucina, Roy, Ike, Palutena, Shulk, Lucario, Greninja
Considering that it can't be charged in the air like WFT, Mewtwo and Lucario can, this is
terrible. CS either needs to be chargeable in the air, OR it simply can NOT be nullified so easily by so much of the cast.