Method Man and Ludacris being mentioned is ridiculous as they both have tons of solo hits, tons of solo album sales, and Grammys.

The answer is Canibus. An artist known for being amazing on features, super hyped off of those features, and absolutely no solo success whatsoever. When i was in high school Canibus was being mentioned just as much as DMX as they both had amazing features on songs. Difference was that DMX lived up to the hype with his first album while Canibus made the mistake of linking with Wyclef (i like Wyclef but he doesnt know how to make Canibus type music) and putting out a god awful first album. His second album was actually decent but it was too late.