Yes a spot is needed in the Wallabies for Cooper but I think it might be too late even if O'Connor has a shocker on Saturday night against the Lions -- probably Barnes or Beale will be next in line. Not sure about Hook having the same X factor/ unpredictability skills as Quade and does Henson still play International rugby anyway ?
Cooper is the best of the three. I would include him in the Wallabies squad. Hook is probably a Welsh test player (although Biggar is better-no pun intended). Henson is overrated. You could throw cipriani in there as another example. But these last two are not test players at the moment.