Sure we have quite a few decent second rowers, but what everyone is calling out for a good to great second rowers. From what I've seen so far Maubbs has played better at center than lock. Fitzy is coming towards the end of his career, expecting him to retire at the seasons end. Sa could be good if he gets his head in the game and out of French rugby union as he is terribly inconsistant. Mason hasn't been consistantly good for 4 years now and has proven he is best off the bench as an impact player. Koupiristas is only an average player at best really and is a player you like to have off your bench for depth. Ahern from what I've seen in the couple of games is very raw still and I don't know how he will turn out. You didn't mention Shack who has been one of our best by far this year, and Cherrington, probably our best second rower in terms of current ability combined with potential.
I agree, Jones is terrible at center, never looks threatening at all. Maubs has proven he is a good center though, good defender, strong runner and has plenty of pace to burn also, so he might be wasted at second row.