Ek OnKaar Sat Naam
I am pleased you found it interesting ji. It is indeed speculation. There is little that isn't speculation when it comes to debates on religion? As Guru Nanak Dev ji most pointedly points out so many find time to opinionate (including myself 
).
Furthermore, all they do is think they know more than the next:
Speculation is the bedrock of all religions. They are all founded upon opinion.
However once one is convinced of one's opinions then spiritual progress can be made on the spiritual ladder. One's mind state is completely changed when one firmly believes in a set of opinions:
When "wftw ji" wrote of regurgitating bani, and rocking back and forth, he/she did not understand the state of mind of the one's with faith in what they do.
When he wrote of errors in history, he/she did not understand the state of mind of the one's who believed in it, whatever was told to them.
The same will apply to those who visit the Kaaba, or worship a stone, or believe in God having a son. It does not matter. All practices, including Sikh practices, are based on opinions but they become extremely useful to the ones who hold faith in them AND PRACTISE TRUTHFULLY. It is the practising that is often at fault. This leads to people noticing evidence of hypocrisy. SGGS is full of references to hypocrisy.
However when wftw ji wrote of lack of knowledge on part of granthis he/she did not seem to note that even gyanis are human. They are not necessarily perfect. They will form opinions and they will re-express them. Yet their faith in their opinions or perceptions fulfills their own minds needs, and what they re-express satisfies the needs of much of the attending sangat. The sangat reattends the following week and this is evidence of its satisfaction.
You have referred me to advice in Gurbani to seek the company of the sants.
The most holy is the Lord. There is no sant above or equal to the Lord. The place to find the Lord is within. His shrine is within, in the inner temple of the mind. In His Darbar, the sants, the siddhas, the demi-gods, the devtas, the angels all sing kirtan night and day. The naad resounds.
One will not necessarily find the holy sants sitting on the floor in the diwan hall of a gurdwara, and the knowledge or wisdom we often seek of gyanis does not have to be sought solely of them - instead we can find the Lord within, with His grace.
P130:
When we rise above opinionating upon others opinions, then we move away from duality, and move towards single-minded focus on the Creator. We may then with His grace, see His light in all opinions, whatever the opinons are. He is the source of all paths, or opinions expressed abou Him, whether they are expressed by Sikhs or by members of other faiths or their multiple sects.
I wish you and wftw ji well on your paths, and trust he will note he/she does not need to query the paths of fellow co-disciples, which are rooted in faith of their perceptions.Instead I hope he takes time to read and also reflect very, very deeply upon Gurus' wise words all found in SGGS ji. There is deep eternal truth found in SGGS ji, but when we look outwards our minds begins to wander. If we have faith in whatever we say we believe, then notions about others failures to be realistic about history and lack of religious knowledge of others, all falls by the wayside.
The same reason is why I brought up the ideas of nepotism and rituals in Sikhi. If someone looks for defects in others they will find them. If someone simply practices truthfully in what one believes, then it becomes insignificant and immaterial what others are up to. They simply merge into the background of creation and are seen as other facets of the Lord's great creation. What will matter to the Lord, I believe, is what one does, not what others do.
Sat Sri Akal
