Conclusion 

I don't know what's your problem with the word conclusion but changing it to opinion weakens Davis' teachings and makes him appear unauthoritative. He descended from that lineage and in that book he is presenting each of the gurus in his own parampara. It wasn't research or scholarly work, it was a Kriya Yoga textbook written by an insider, an ordained representative of the same lineage that is being discussed. It is not a book of conjecture or hypothesis. If Davis claims that Mahavatar Babaji is Hairakhan Baba then that is clearly his conclusion, it is not some popular idea that he just presented for the readers to decide, he stated it as a fact. The person is a Guru of the Mahavatar Babaji line, not just an ordinary initiate. -