Pearce who also thought she was PVS (as did all her GALs and her parents and doctors)? Nothing wrong with liking him. He just wasn't as far away from the other GAL reports as you think.
If you read the report carefully, Pearce was merely stating what was already agreed to in previous court rulings about her 'state'. He conducted no new finding of fact, he recommended no new finding of fact, he consulted no one about the possibility of a new finding of fact with regards to "PVS".
After the 'facts' were determined in the initial case, there was no further legal questioning that could be done, hence the Congressional order for a 'de novo' review.