Ioane The Great - based upon his 2013 performance level - is gradually evolving into a myth.
Yes, his line breaks and tackle busts are excellent, and valuable. But rugby stats so often are wrongly focussed upon 'events' in isolation (such as possession %, run metres, etc), rather than the more important yet more complex measure 'effective points yielded via multiple linked events' or more simply 'effective outcomes'.
Look at Digby's outcomes more closely. He's scoring few tries, and often his breaks and busts lead him to disappointing endings where he either knocks on, loses the ball in some way, passes poorly or too late, or loses his support players. IMO, his 'glamour stats' are thus misleading, as his 'effective yield in terms of linked event outcomes' for his team are nowhere near as compelling even though they are way less remarked upon and analysed properly (partly as our Aus Fox commentators are so intellectually lazy and easily impressed by 'dazzling breaks' and 'big hits' and such like)..
This is not to say he's not a valuable, skilful player. It's just that he's nowhere near as 'irreplaceable' and a 'terrible loss' for the Reds or Wallabies as many argue. I would almost guarantee that Speight (for example) would yield more effective outcomes per game for either of these teams than the 2013 vintage Ioane.