No problem man, I'll be happy to explain this. Of course, it's subjective, so feel free to disagree. God knows the east coast peeps do.
Master P bought the rights to several Tupac songs, and re recorded them with his own voice and put them out(example, his version of when we ride on our enemies). He tries to sound like Pac, uses Pac's language and image, recorded several tribute tracks to Tupac though the two never met, recorded songs called "made niggaz" and "hitemup" and an entire album called "only god can judge me." C-Murder has been doing the same shit. Master P was not really big before the Tupac era, and the music of the no limit era was undoubtedly a commercial angle on thug rap.
DMX uses the exact same thug image that Tupac perfected. He recorded a song that sampled the same Phill Collins song that Pac's starin at the world through my rearview sampled. Mostly though, X's biting comes from his subject matter, and introspective thug image. I believe this to be X's rough approximation of Tupac. You have to admit, the images of the two are quite similar, and although no one had this kind of introspective thug poet image before Pac, nowadays, everyone seems to want it. Comparing DMX's early 90s shit to his 98-now shit yields an obvious conclusion: DMX sounds a lot more like Pac now than he used to, before Pac had his impact.
Ja Rule falls in a similar catagory. There's various biting on his part all over the spectrum, including the same calculated immitation of 2pac's image. He recorded a new verse on Tupac's old classic "pain," he admits his favorite rapper is Tupac, and he also has recorded tribute songs to Pac, though these two have also never met.
I've been observing rap for a while, and I can honestly say, that after Pac went, the pendolum of rap took a giant swing toward his style, image and subject matter.
peace