I'm not talking about a court case, but an arbitration. These are not questions of civil or criminal law, but of interpreting clearly written rules.
Your failure here is one of logic -- something you are apparently completely untrained in. A failure to establish pork as the "more likely than not" source does not establish that any alternative is "more likely than not", on the balance of probability. The conclusion of intentional doping was only made possible by presumption, combined with logical fallacy. An alternative presumption of non-intent would lead to a finding of non-intent.
As an illustration, if we "presume" that pork, legal supplements, and a banned product are three equally likely sources among positive tested athletes, there is no "most likely" source determination possible, without "specific and concrete" evidence overriding the presumed likelihoods.
What makes the "intentional doping" argument so weak is that the outcome is completely determined by the initial presumptions.
Another failure is your attempting to rewrite the CAS reporting to say evidence of intent/non-intent was presented ON BOTH SIDES. The WA/AIU presented no evidence of intent. They only argued against the evidence of non-intent. If they had, the CAS would have included these details in their report, and you could point me to the relevant paragraphs in the CAS report showing the evidence of intent before the CAS.
I don't find presuming intent a "logical" starting point, but rather an "expedient" one for anti-doping bodies, at the expense of both innocent and guilty athletes alike. We have seen that in other cases, like Lawson and Getzmann, that athletes found innocent were still punished with a 1+ year suspension, and a five-figure arbitration. There was no compensation for legal or scientific expenses or lost earnings and sponsorship. In the best case, even when clean athletes win, they still lose. The esteemed Prof. Ross Tucker estimated that a clean athlete who consumed nandrolone from pork might have to conduct a large nationwide experiment, lasting six-months (likely more), and costing six-figures, and it still might not produce the results that would permit the athlete to overcome a presumption of intent, in a low probability situation as nandrolone consumption from pork.