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Matt Phillip with Rodda fit would possibly the best lock pair in the Australian Super Rugby sides. I wouldn't want to stop the development of our young guys, though.
Hardwick is a nuggety bastard. He'd provide a very good option for our back-row, but it's not an area where we are lacking.
Louwrens probably wouldn't get a game with White and Fines-Leleiwasa fit, but he'd be a decent injury cover.
Nick Jooste likewise wouldn't get many games, but covers a number of spots for injuries.