Biggie and Pac were friends and as friends you share interests and styles so it's natural that some of you and your friends' styles are similar or certain characteristics and styles you share.
But to act like Biggie stole from Pac is bullshyt.
Pac was his own man
Biggie was his own man
Like Biggie said in his interview with Sway, he said:
"he schooled me to a lot, because he knew a lot. If you was my man and we hanging together or whatever and you doing a certain thing and you gon tell me 'if you gon do it, you should do this way.' It wasn't a situation where he did something and I watched and stole it. He told me yo, 'you can do a whole lot of things in this game; you can be the broke rapper or the rich rapper. You can rap as hard as you want on your album but just make sure the radio got some joints. Make sure you got those radio friendly records that the girls is gon like, that the radio is gon like and is going to help you sell your album.' And I took that into consideration by making "Big Poppa" "One More Chance", "Juicy" and stuff like that. It was advice, it wasn't nothing getting stolen."