Top 10? I would put money on him being at least #2 and giving Aesop Rock a run for his money for #1 (depending on which albums his 35,000 words fall on - he's got a solid discography). I just put on A Book of Human Language(https://www.youtube.com/watch?v=lwVNp42l3Xo - full album or https://www.youtube.com/watch?v=GnsCO0Fxw3A - solid song selection). Along with that, Wu Tang as the only crew analyzed? how about Freestyle Fellowship (Aceyalone's crew), Quannum Collective, Jurassic 5.
I'd also like to see Mos Def on the list, along with everyone from Quannum, and the Soulsides and SoundBombing volumes.
Also, (unique words : total words) might be an interesting scoring method, and would allow comparison over entire works regardless of their individual volumes of output. Or choosing a random sample of # of words as opposed to first # of words, as someone who started publishing as a young buck may take a hit for early immaturity.