Well, the rule that they have rescinded the ban on is article 296 which states:
If the Rider establishes in an individual case that he bears No Fault or Negligence, the otherwise applicable period of Ineligibility shall be eliminated. When a Prohibited Substance or its Markers or Metabolites is detected in a Rider’s Sample as referred to in article 21.1 (presence of a Prohibited Substance), the Rider must also establish how the Prohibited Substance entered his system in order to have the period of Ineligibility eliminated. In the event this article is applied and the period of Ineligibility otherwise applicable is eliminated, the anti-doping rule violation shall not be considered a
violation for the limited purpose of determining the period of Ineligibility for multiple violations under articles 306 to 312
If he can prove this, then fair enough and he should have no qualms in providing the evidence to do so. As it stands, he hasn’t provided this evidence – which doesn’t make him look good. It’s not up to the UCI, RFEC or WADA to prove or investigate this – it’s up to Contador.
The issue is that there has been no evidence made public that shows the ban should be overturned. If this evidence exists there is no reason it should not be made public and I’m sure he would then be exonerated by all. Both Contador and RFEC are bringing themselves into disrepute by not providing this evidence (or some other legitimate, provable reason)