just high level game knowledge and being able to go very in depth on everything, mostly referring to deficio/krepo/amazing etc, all of whom had the benefit of being pro players at one point
why did x team do y, why did x happen, what should team 1 have done to win, etc..
fwiw you're by far the best caster/analyst on broadcast
So again, out of curiosity, would the example I've linked below be the level of depth you're looking for? I don't expect you to listen to the whole thing but find a random timestamp and give it a listen. I'd genuinely love to know if you're looking for more depth than the below example, so please don't interpret this as me being condescending or rude.