how was gamzee responsible for bec noir? i thought it was more vriskas fault

It was Vriska’s fault that Bec was prototyped, BUT

Gamzee was the one that put the nightmare Harlequin in John’s dream room which caused him to draw harlequins on his wall which caused Dad Egbert to think he liked them and prompted him to get that Harlequin Doll for John’s birthday which ends up being prototyped and having to wear the damn clown hat is what drives Jack Noir to murder the Black Queen and take her ring thus leading to him kickstarting the Reckoning and becoming Bec Noir.