Seems to me Emily is saying exactly the same as you, Linde. She's saying that for all the positive impact he had on their lives, and despite John and Brian's friendship, she doubts any help Brian could have offered would have prevented John from going down the road he was on.
I understand that Yoko is disliked by many here, but I think she's taking too much blame for John's drug situation. I have little doubt John would have gotten too heavily involved in heroin with or without Yoko. That's just who he was. Remember, John would often reflect on the ...