Mr Rudhraiya studied at the Adyar Film Institute and, he recently passed away. According to some, he brought fame to his alma mater. Mr Rudhraiya also studied at the St. Joseph's College, Tiruchirappalli.
The point is not so much that Mr Rudhraiya was a studied man, it is more that we know this about him. As more information like this is known about "living persons", they get a better representation in Wikidata.
At this time only two movies of Mr Rudghraiya are known to be directed by him. There must be many more. It is possible to know all the people he worked with by connecting him through his movies, With more data this information becomes more complete.