Don't think Cahill did any better with or without AJ to be honest.
Certainly his goal stats don't support the he was better with AJ argument.
Its not just the AJ arguemant though, when we signed Bent and Cahill, Cahill scored loads playing off Bent and got on the end of alot of chances and Bent was a similar type of player with his movement.
Then the seasons weve had Yak and Saha, Cahill as got his goals dont get me wrong, but not as many and in that time playing off one of those two, his form dipped and he wasnt scoring, fair does he was getting played deeper or wide due to injuries in the team and alot of people was calling for him to be dropped but i just think if Cahill as a striker infront of him who's always on his toes and as good movement then Cahill as space to exploit and make those late runs to get on the end of things better instead of having Yak or Saha stuck centrally and blocking that space off for Cahill to get in.
If you think about it, Cahill got alot of his goals from set plays last season and the season before that, when we had AJ or Bent, he got goals from exploiting the space and getting on the end of things arriving from his deeper role, getting on the end of crosses or moves and playing behind Beckford in pre-season he was doing exactly the same.
I'm not saying Beckford should be are main striker but maybe we could use him and hope he gets the goals and brings out the best in Cahill or brings out a better goal threat from Cahill or sell Yak and buy a more proven, better quality of striker that as better tools than Beckford to play up top.