You show me your medical experts, and I'll raise you two. You seem like an intelligent guy. You must know that there are at least twice as many medical experts who have examined Terri since Greer determined her to be "PVS" who dispute that finding.
Kind of a moot point. We can argue this until the sun grows cold. However, the parties to this case have had the chance, numerous times, to debate this case in court. Every single time, the courts have sided with MS. Maybe you disagree with the courts' decisions. So be it. You're just going to have to accept that most people, and all the judges involves, simply do not agree with you.