The main issue I have with Mayo as contenders is that their defence seems to have taken a big step back this season. They aren't tracking back as much as they were and their use of supporting defenders isn't what it was. Cork have the makings of a contender but they look a year away from really putting it up to Dublin. The biggest advantage Dublin have is depth. They have a bench which enables them to play a far more pressing game from the off than most counties can chance.