Wow. Thats bizaare. I have false memories of the Kata/Ngani debate. So who was holding Ngani out? Who took his spot the times he was demoted? When he came back from off-season over-weight, and when he was dropped mid-season?
Google results just keep pointing back to this forum so hard to say. Looking at Manu's 2014 highlights vids it looks like it was Dane Nielsen a lot of the time.
Total footy stats has him playing 16 games in 2014, missing the first 5 and then a block of 4 mid Season which largely matches Dane's games, though theres a handful of games with both of them.