Regarding Christian, I firmly believe his drop in form, both generally and in goal kicking, has resulted from his ankle injury suffered last year. It obviously takes time after severe injury to refind form. In Horwill's case, how long has it taken for him to come back to something like his pre-injury form? A full season more than Chistian's had so far iirc.
However, I am just as bewildered by the Brumbies continuing to start him in favour of Pat McCabe this year, and continuing to have him take the goal kicks in favour of Nic White. Both poor decisions by the coaching staff imo. Like others, I think he would have missed the Wallabies' squad this time round if Godwin had been fit and available. But I don't think there have been any other 12s whose play would consistently have them in front of Christian, and apparently Link thinks that way also. I fully expect him to come back to his best form with full fitness.