If Federer had beaten Safin in the 2005 SF, he'd have won 4 in a row.
Let's see Djokovic against in-form Safin. Wait, we've seen that before...and it wasn't pretty from Djokovic's end.
I'll agree that accomplishment-wise, Djokovic is probably going to be the greatest ever at the Australian Open. Who knows how it would've played out if they stayed on rebound ace, though.