I'm not sure we got the full story on Cody leaving. I think it's probably some personality and pressure issues between him and the whole crew. Or just WWE saying “We got this sack of money over here"
I think he was pulled being a producer of the show and talent and realized he wanted to be a focused talent on that. and WWE has a tremendous machine behind him.
AND he brought things we liked about AEW with him. Raising up everyone. ~ Sorg ( @sorgatron)