Djokovic - AO: Had to rely on a Nadal mini choke at 2-4 in the 5th.
Nadal - FO: Djoker had all the momentum and a break when the match was interrupted.
Federer - W: Indoor grass festival in semis and finals.
Murray - USO: The hurricane...in semis and finals
So, any other year with more lucky slam winners?
Djokovic got lucky in Australia indeed
Nadal would have won the Roland Garros match regardless, you say it's 'fortunate' that they stopped play, but you are aware that clay is not meant to be played on when constantly wet / drizzling conditions for over an hour. no umpire / tournament runners would NOT stop play at some point in that, regardless of match or tournament.
Federer - it is what is is, he probably would have won no matter what.
Murray - indeed lucked out. this is really the only instance where the result was probably dramatically affected by weather conditions and/or tournament decisions.