The only "real deal" in the Buddhist camp that I have come across is Boddhidharma. The indicator for me was in his history. I wondered all over India looking for a dharma center that would accept him, including Nalanda Buddhist University. He was rejected by all of them. So, he literally took a slow boat to China, and when he got off he was lionized because he was the only Indian Buddhist in the country. After about a year he was invited to court to meet the emperor, who had built a bunch of Buddhist monasteries.
There the emperor asked him, "So, I did all of this good work for Buddhism. I must have acquired lots of merit."
Boddhidharma said, "No merit."
Boddhidharma was banished for the rest of his life to the frontier, and the emperor eventually destroyed all of the Buddhist monasteries that he had built, but left Boddhidharma alone, possibly because he was so far out of sight, that he was out of mind.
In the 5th century there was a Buddhist monk in Sri Lanka who claimed to be an arahatt. His discourses centered upon jhana. The other monks rose up against him, and his followers, burned his monastery down, and killed all of the monks. Then they published the Vissudhimagga to overshadow the legacy of that monk's work. So, I think it is likely that he was an arahatt
Otherwise, the evidence suggests that Buddhism has been dead for about 2,000 years.