So, one of Noelle's voice lines has me thinking:
1) "Inherited from my grandfather" my ass,
2) Do you think Kaeya has a special eyepatch he pulls out specifically for when he needs to pull the "inherited from my grandfather" bullshit? Maybe he actually did inherit one and he saves it for those occasions? And,
3) Do you think Kaeya has a bulk supplier of eyepatches? I mean, from the sound of it, he buys a lot of them. Surely someone sells them to him in bulk