As the expression goes, no one can keep the fire burning forever. Though some acts have written some quality stuff every time they go into the studio, it's anyone's guess as to whether that kind of magic will actually last. Even if the more manufactured MCs have fallen by the wayside, these rappers have always brought their A-game when they stepped up to the mic.
From rap's dawning in the '80s up until the present day, these artists have never really struck out with a terrible record. While there are definitely a handful of classics sprinkled amongst the bunch, none of these artists have that one outlier in their catalog that fans like to point and laugh at. Rather than just ride the waves of the rap genre, each of these acts have acted more like career artists who were always focused on taking the genre to places it had never been before.
Even with the shorter catalogs amongst the bunch, a handful of these artists decided to either not mess with the perfection that had already attained or simply weren't around long enough to build on any of their foundations. Though we can only speculate what these acts latest records would sound like, the stuff we already have has been top tier for years, if not decades at this point.