a heavier version of the same "type" of RB as Smith. Smith has more "shake" to him and IMO greater upside physically as he matures. Green does seem to not be a natural smooth receiver but that doesn't mean he can't learn to catch the balls he would get in this position.
Isaac is not a burner. He's not slow but he certainly isn't a sub 4.5 athlete. Additionally, there is no evidence from his film that he was/is a good blocker or power runner. Doesn't mean that he isn't, but with his team and those epic holes opened up he didn't have to do much else. Isaac has a very narrow frame. Don't know if he will be a 240 guy.