Aiden O’Connell switched jersey numbers because he feels it disrespects Derek Carr

Aiden Connell felt like he’s indirectly telling Raider nation : I’m your new Dc4, you can absolutely expect me to duplicate and surpass that which the OLD Dc 4 did for you. When I’m done you won’t even remember DC4. That’s a lot expectations to live up to. So when he inevitably failed, I bet he couldn't wait to get rid of that cursed shirt.

Certainly possible that this is more about him not wanting to be directly compared to Carr and thinking that not wearing his number will help.