When writing rap lyrics....

[BOOFY92]

It's all in the flow for sure, the flow can dictate what your next line will be. It doesn't have to be meaningful or have a story it can be complete nonsense, if you're more musically minded than you are lyrically then you'll write a instrumental and you could in theory just ad-lib over the whole lot and it'd still make a decent track.

[SRXjwKs7]

All of them

[Serling]

Really I put a lot of focus into the general feeling that I'm invoking through my rap. I guess that would lean more toward delivery, but I think all of the things you listed contribute to that.

[ben_john7]

Listening to rap created in recent years, for the authors, the main thing is the rhyme, not the meaning.