It depends on how you look at it,the hip hop industry is full of former street hooligans, so a lot of people would have that jacket too.Pac was hanging with Henchmen because of his rapper homeboys in NYC.
lol Pac didn't really beef with FBI , he is not superman, his folks was Panthers and had all kind of problems with the law so they had support on the street,which is were 2 Pacs street connections come from.
How much times did you see Diddy doing that in his pictures,this is ShinySuit Man and Mr Remix, now this dude is flipping his middle finger. Diddy looks like he is mocking 2 Pac in that pic.
Well I am not sure if he is mad at that but he still doesn't like dude. There are dudes from the streets who have beef with dudes for 20 or 30 years for whatever reasons. Sometimes you may be over something someone did ,but when you see that person who did you that dirty deed, you would remember them for what they are and recount the hate you had.