This is a general share among our Sangat from writings of Prof Sahib Singh, where he directly mentioned that Zafarnama was written by Guru Gobind Singh Itself and so Bachitar Natak, Akal Ustati is. He used dasam bani in various of his writings. The ultimate thing is the way he describe Kaal, Bhagauti and all terms which are wrongly interpreted by some of our fellow sikhs and even they claim that Prof Sahib Singh rejected Dasam Granth in whole which is wrong.They even rejected the views of Prof Sahib Singh over Dasam Granth(less researched) and claims that his views would destablize Sikh Panth, along with Kahn Singh Nabha Views.
> http://sikhisearch.blogspot.com/2011/11/prof-sahib-singh-about-zafrnama.html
> http://sikhisearch.blogspot.com/2011/10/extracts-on-dasam-bani-from-prof-sahib.html
> Guru Gobind Singh and Devi Pooja in Unicode:
http://sikhisearch.blogspot.com/2011/12/unicode.html
Thank You
Best Regards