Is it true that the greatest Indians in the history of India are all SCs only?

 Is it true that the greatest Indians in the history are all SCs only?But this fact is suppressed to undermine their merit?

• The greatest Indian Emperor is Ashoka, who comes from a family of peacock tamers.
  
                                                                                        (Image credit:Khyentse Foundation)
• Saint Thiruvalluvar,the greatest Indian poet comes from a SC background.
  
                                                                                                    (Image credit:Facebook)
• The Tamil lady poet Avvayar,is again a SC.
  
• Valmiki ,the author of Ramayana is a SC .
                                                                                                                                                                                                                                                                                                                                                                                 
• The greatest intellectual of India with highest academic qualifications and  prowess in modern India is Dr.Ambedkar.                                                                                                                    His qualifications - B.A.,M.A.,M.Sc.,D.Sc.,Ph.D.,L.L.D.,D.Litt.,Barrister-at-Law. D.Litt.( Osmania University). Doctor of L Barrister-at-Law (Gray's Inn, London), Highest law qualification in England (At that time)literature. 
• 
                                                                                (Image credit:Ambedkar College)
• The greatest living musician of the times is Maestro Ilayaraja,He is also a SC.