We sent agents to interrogate him (Canadian Citizen) without representation of his choosing in a court system that is properly recognized. GC agent broke the law pure and simple just as they did in the Maher Arar case and just like that case the courts had the case gone the distance would have found for the plaintiff and would have awarded him at least $10MM plus legal costs which are in the $2MM - $3MM. He was suing for $20 MM plus legal expenses.. Include the the GC's legal cost and settling was the only real rational decision to make. 
Had the GC not send agents to interrogate him. There would be no case for him to pursue against the GC. The knuckle heads in the Martin Libs and the Harper cons forgot that all citizens no matter how distasteful are entitled to their constitutional rights. And the institutions are robust enough to spank the government of the day for its wrongs.  What Khadr did or did not do is completely immaterial to the case.