Aum Sai Ram
Yes,certainly,Sri Sathya Sai Baba of Puttaparthy is the reincarnation of Shirdi Sai,as SAI represents the KALKI avathar of Lord Shiva,which got splitted into three forms on the request of RISHI BHARDWAJ,first was Shirdi Sai,second is Sathya Sai,and third will be Prema Sai in Mandya in Mysore.GOD needs no recognition and certificate of human beings.Sathya Sai BABA do not owe any obligation to anybody to prove himself but still he has proved quietly on no. of occssions.I would say only that do not allow doubt to creep up in your mind and worship the GOD within.My humble advice is PLEASE VISIT PUTTAPARTHY ONCE ON MY INSISTENCE AND YOU WILL NEED NO PROOF.
However,I am not asking you to start worshipping Sathya Sai,so do not feel otherwise.
SaiSewak