At this point, I really don't see any reasoning behind comparing Nas to other rappers. He's at a different level at this stage. There's Nas and then everybody else. We're really comparing current Nas to different eras of Nas. That's no disrespect to other rappers, but has anyone other MC, especially of the caliber of Nas put out 4 consecutive projects of the quality of the KD series and Magic at this stage.
Andre 3000 is my second favorite rapper ever (Nas is #1) and if he put out four albums on the level of the KD series and Magic, there would be no arguments about him being GOAT. Even if he delivered something on the level of Magic and it was just 9 songs, I could see people losing their minds and he'd be elevated to GOAT on the strength of it.
If Jay came with another series and was on the level of the KD series, we'd be talking about how no one is on Jay's level.