I don't really think you can compare the two.
Sure Moss was a great player, but when he was traded he was coming off 2 pretty bad seasons for his standards.
The year he got traded he came off a season where he played 13 games and got 42 catches for 553 yards.
The year before that he played 16 games and had 60 catches for 1005 yards.
Julio is coming off back to back 1400 plus yards seasons, is a year younger, and is a class act.
Randy Moss was a complete head case who wasn't producing that well as he was reaching his 30s.
What I am trying to say is for the bills to get Julio , it will take A LOT more than a 4th round pick