Despite being slamless, Murray has more chances than Rafa because he's better on hard courts. Rafa is a better player, but Murray is arguably a better hard court player.
Murray still won't win though.
in general Murray is a better hard court player but not better than Nadal on hard court IN the best of 5 format, or SLAMS.
it is no coincidence that Nadal has multiple Grand Slams on hard court and just recently at last year's US OPEN (hard court) beat Murray. Nadal is definitely the better hard court player when going the distance in best of 5. Murray is a better hard court player out of the main events in tennis, which unfortunately don't really matter nearly as much in the full spectrum of things.
Murray doesn't have more chances and you merely using the fact that Murray is great at best of 3 hardcourt tournaments means nothing. how can a player who is worse at hard court in a best of 5 format have a better, or more, chances than a player who is good at them?
the mistake you make is mixing things together as though tennis is always the same. just because Murray is more consistant on hard court does NOT mean he is a better hard court player than Nadal.
quality over quanitity.
delusional of all of you to imply Nadal does not have big chances at AUstralia this year. if he wins the title how will you all feel hahah