This is just rewriting history, Cahill was a raw youth in 2006/7 and certainly not good enough to hold down a regular place in a premier league team that was trying to challenge for top 4. He had been brought into the first team too early due to the failure of the previous chairman to provide adequate funds for transfers and quite understandably wanted to go on playing at that level. He had run out of short term loan opportunities and selling him to Bolton was a good way of helping him get what he wanted - he went to a lesser side whose main concern was avoiding relegation and he was able to learn his trade there. He was pretty inconsistent in his first seasons with Bolton.
In my view he is actually still inconsistent and his game has flaws but with the experience he has gained, and surrounded by a starry Chelsea side costing billions of pounds, it doesn't show up so much.
Oh, and £5m was a pretty good price for him considering the stage of his development. Not all youth team players get to flourish at the club the were apprenticed to.
No it isn't rewriting of history, it was a stupid idea then, only made worse by the passage of time. O'Neill inherited a defence that had Laursen, Mellberg and Cahill as central defenders. He then spent over £20m on Curtis Davies, Carlos Cuellar and Zat Knight. Yes that's right kids, Curtis Davies, Zat Knight, and Carlos Cuellar. Cahill may have been a raw youth, but he was already better than Curtis Davies, and much, much better than Zat Knight. O'Neill also pissed Mellberg off by playing him at right back. So as well as pissing off one of our best ever servants, he let our most promising young defender in years go, while spending a fortune on some absolute donkeys, who he then had to replace wholesale 12 months later due to the utter ineptitute they displayed. And that's without mentioning Nicky Shorey and paying massively over the odds for Luke Young. When it came to defenders, O'Neill was an absolute fool.
I am really annoyed at this rewriting of history by Risso.
MON inherited a central defence of OM, ML, GC and Liam Ridgwell; how could he forget him...