The only one of those players who is possibly better is Horne...
Mortlock is well past it... Chambers has been rubbish... and Ioane is a far better winger who does ok at Super level in the position...
AAC (Adam Ashley-Cooper) was solid at outside centre for the Wobs last year and played some great games, including MOTM against the French...
To me, the only reason why AAC (Adam Ashley-Cooper) sucks this year and last, is because of the player maker inside him in Giteau. Giteau has made AAC (Adam Ashley-Cooper) look ordinary, put AAC (Adam Ashley-Cooper) outside Cooper or O'Connor and you will see why he is the best 13 in AUstralia, no centre in Australia runs a like like AAC (Adam Ashley-Cooper). You see why SBW and Fruen are so good, not because of their size and skill set (But that helps) but the space that Carter provides them. QC (Quade Cooper) and JOC (James O'Connor) would do the same for AAC (Adam Ashley-Cooper)..in my mind....get rid of Gits, get Lealiifano (only five eighth in Brumbies Stable who can straighten the attack) into the play making role, and watch the Brumbies backline function, for ONCE !
He's also played well at 13 for the Brumbies back in 2007 when Morty was injured... unfortunately he's had limited time in the position since, and although backing up as a great fullback it's in everyones best interest to see him at outside centre...