Yeah, Aceyalone is probably my favorite MC ever personally, though J-Live is up there as well, along with Chali 2na, Awol One, Busdriver, Ab Rude, Gift of Gab, Lateef & Lyrics Born, the Genius/Gza, Playdough, Scarub, LMNO, L*Roneous, Killah Priest, Mars Ill, Subtitle, & Ugly Duckling.
As for if Sunsoft could sue them? Absolutely! However, they probably aren't making any real money, for all I know, they could only take them to small claims court. Ususally, artists that aren't very big, can get away with lot's of copyrighted stuff. Not like the old days, when people didn't bitch about someone using a sample from something, people are too fricken picky. When my brother was in the industry as an MC & producer, there were many that wanted BIG $ for samples of their stuff since they started cracking down in the early 90's, it was a bummer to be sure. I think if anything, I think people should just be required to list who they sampled, that way, the people listening to the song may want to check out whatever artist was sampled.