Dear Davis Cherian, Pathhikan ...Thank You,
The same book described about Koonan cross Oath as follows
It was conducted under the leadership of Malabar Catholics.
It was not against Catholics, its against the Jesuits.
Page 156,157 says
Mar ThomaI, II, III, IV had no valid Episcopal consecration.
The Catholic Church in India
Published from Rome
This book translated 7 Languages.
There is a quote in it
Truth is soul of history. Without truth history is simple story or fiction.