Have to agree Tony Arena is one that was a great recruit for...

Have to agree
Tony Arena is one that was a great recruit for TNG, IMO.
I've worked on enough projects, including currently in Iron Ore, that for someone to come across from the role he had at Roy Hill, it is my opinion that he must have seen something special with TNG. 
Roy Hill is a new plant & has years of optimisation of production, in other words Tony has left a long term, very challenging, well paying role at Roy Hill.
People who get to the level he was at are incredibly driven individuals. Ambitious, motivated, well trained/highly skilled, it is not something everyone is cut out for. 
So when they talk about identifying the gaps in their team's capabilities & filling them, TNG are doing exactly that.