I think he would like to believe the absence of evidence justifies believing a pickled tongue belongs to St Francis. Ideally, it would be the "extraordinary evidence" he seeks to justify Catholic claims about the tongue.
If that's the case, what's he doing wasting his time chatting us up about it?? I don't know jack about St Francis or tongue preservation or the process of biological decay.
Take it to the press, take it to scientific organizations, take it to the James Randi foundation. If genuine, it would make headlines, baffle scientists, and win a ton of money. After winning fame and fortune, then he can talk to us at his leisure. If verified, I'd have no choice but to side with the experts and concede at the very least to a medical anomaly. Bring more in, and I'd have to change my perspective even further, especially if these anomalies are closely associated with only one religion.
Fame and fortune and crow-eating from skeptics await. What's the holdup?