Aware of that, but equally you could say Lang is a centre/FH/FB - and yet none of us really know where his strongest position is. Just like the debate over Alofa - is he a 13 or a winger? And that's the problem with these utility players - they never get long enough in one position to really nail it.
Which is why I hesitate over Herron (and like I said, happy to reserve judgement). Just feel like unless Herron surprises us, our options at FB (whilst not inadequate in numbers) feel a little light in quality after Brownie. Then again, that might just be because they're understudying for one of the best all-round full backs ever to have played the game...