I mean really I think you gotta seperate Beef from lyrically assasinating someone, I mean it would be like a dude with a PHD arguing with a dude who can't read good if it became a lyrical thing, but beef is where 50 would wanna keep it, he can make up some shit about Nas in the Hood, say he got more money sold more records, stuff like that anything but lay something down lyrically that could compete.
Thats why the jay/nas thing was special it was lyrical back to the old tradition not just some dude taping conversations and getting at dude outside of rhyming to clown someone thats where 50 wants to be. Not locking horns in battle, he don't want it there.
so the measure of his skill is his wallet at this point. but that ain't the only measure of a man though something Nas would surely point out lyrically.