Nah, Heavy-D's verse on Jam isn't the disqualifying factor for it being taken off the list. It's the fact that it's a Michael Jackson song. It's like if Justin Bieber made an album where he raps on a handful tracks (in between singing) and it's considered a hip-hop album. No, it's still pop. Heavy-D's songs above, however, are rap heavy (heh) and can be argued don't belong in the genre.
Also, I forgot to mention this in my earlier post, but what is that Queen Pen song doing in this thread?