Some misquote Bachittar Natak and claim that because the writer of Apni Katha mentions that he was sent to the World by Akal Purakh, because everyone before him did not comprehend the Supreme Lord, means that he is denigrating Guru Nanak Sahib along with other Guru Sahibs.
Now how they reach this conclusion is not clear. In Apni Katha which forms part of Bachittar Natak (Wonderous Drama), Sri Guru Gobind Singh Sahib, being a pronounced poet, dramatizes the driving cause behind his coming to this World for the purpose of propagating Dharma. Guru Sahib writes:
ਹਮ ਇਹ ਕਾਜ ਜਗਤ ਮੋ ਆਏ ॥ ਧਰਮ ਹੇਤ ਗੁਰਦੇਵਿ ਪਠਾਏ ॥
I have been sent into this world by the Preceptor-Lord to propagate Dharma (righteousness). (Bachittar Natak, Sri Dasam Granth)
And before writing this, Guru Sahib meticulously and truthfully describes how those who were sent by Akal Purakh failed to propagate His Naam and instead declared themselves as Lord.
ਸਭ ਅਪਨੀ ਅਪਨੀ ਉਰਝਾਨਾ ॥ ਪਾਰਬ੍ਰਹਮ ਕਾਹੂ ਨ ਪਛਾਨਾ ॥
ਤਪ ਸਾਧਤ ਹਰਿ ਮੋਹਿ ਬੁਲਾਯੋ ॥ ਇਮ ਕਹਿ ਕੈ ਇਹ ਲੋਕ ਪਠਾਯੋ ॥੨੮॥
Everyone placed his own interest first and foremost and did not comprehend the Supreme Lord.
When I was busy in the austere devotion, the Lord called me and sent me to this world with the following words.28. (Bachittar Natak, Sri Dasam Granth)
And Guru Sahib has clearly written the names of those who didn’t follow the command of Akal Purakh of engaging the mortals towards their destiny of following only one Lord. Hence, when Guru Nanak Sahib’s name is added to that list by some, it’s basically them who are being Guru Nindaks.
A few stanzas after that Guru Sahib in the same composition (Apni Katha) writes that his Dharma is the Dharma which was initiated by Guru Nanak.
ਤਿਨ ਇਹ ਕਲ ਮੋ ਧਰਮੁ ਚਲਾਯੋ ॥ ਸਭ ਸਾਧਨ ਕੋ ਰਾਹੁ ਬਤਾਯੋ ॥
ਜੋ ਤਾਂ ਕੇ ਮਾਰਗ ਮਹਿ ਆਏ ॥ ਤੇ ਕਬਹੂੰ ਨਹਿ ਪਾਪ ਸੰਤਾਏ ॥੫॥
ਜੇ ਜੇ ਪੰਥ ਤਵਨ ਕੇ ਪਰੇ ॥ ਪਾਪ ਤਾਪ ਤਿਨ ਕੇ ਪ੍ਰਭ ਹਰੇ ॥
ਦੂਖ ਭੂਖ ਕਬਹੂੰ ਨ ਸੰਤਾਏ ॥ ਜਾਲ ਕਾਲ ਕੇ ਬੀਚ ਨ ਆਏ ॥੬॥
Guru Nanak spread Dharma in the Kaljug and put the seekers on the path.
Those who followed the path propagated by him, were never harmed by the vices.5.
All those who came within his fold, were absolved of all their sins and troubles,
Their sorrows, their wants were vanished and even their transmigration came to an end.6. (Bachittar Natak, Sri Dasam Granth)
Following this, Guru Gobind Singh Sahib clearly writes in Apni Katha that all the Guru Sahibs (from Guru Nanak to Guru Teg Bahadur) are from the same Jyot. And interestingly Bachittar Natak is one of the primary sources after Sri Guru Granth Sahib where all the Guru Sahibs have been described as being a part of one Jyot, stressing that “only saints comprehend this fact, and fools don’t”.
ਨਾਨਕ ਅੰਗਦ ਕੋ ਬਪੁ ਧਰਾ ॥ ਧਰਮ ਪ੍ਰਚੁਰ ਇਹ ਜਗ ਮੋ ਕਰਾ ॥
ਅਮਰਦਾਸ ਪੁਨਿ ਨਾਮੁ ਕਹਾਯੋ ॥ ਜਨੁ ਦੀਪਕ ਤੇ ਦੀਪ ਜਗਾਯੋ ॥੭॥
ਜਬ ਬਰਦਾਨਿ ਸਮੈ ਵੁਹ ਆਵਾ ॥ ਰਾਮਦਾਸ ਤਬ ਗੁਰੂ ਕਹਾਵਾ ॥
ਤਿਹ ਬਰਦਾਨਿ ਪੁਰਾਤਨਿ ਦੀਆ ॥ ਅਮਰਦਾਸਿ ਸੁਰਪੁਰਿ ਮਗੁ ਲੀਆ ॥੮॥
ਸ੍ਰੀ ਨਾਨਕ ਅੰਗਦਿ ਕਰਿ ਮਾਨਾ ॥ ਅਮਰਦਾਸ ਅੰਗਦ ਪਹਿਚਾਨਾ ॥
ਅਮਰਦਾਸ ਰਾਮਦਾਸ ਕਹਾਯੋ ॥ ਸਾਧਨ ਲਖਾ ਮੂੜ੍ਹ ਨਹਿ ਪਾਯੋ ॥੯॥
ਭਿੰਨ ਭਿੰਨ ਸਭਹੂੰ ਕਰ ਜਾਨਾ ॥ ਏਕ ਰੂਪ ਕਿਨਹੂੰ ਪਹਿਚਾਨਾ ॥
ਜਿਨ ਜਾਨਾ ਤਿਨ ਹੀ ਸਿਧ ਪਾਈ ॥ ਬਿਨ ਸਮਝੇ ਸਿਧਿ ਹਾਥਿ ਨ ਆਈ ॥੧੦॥
ਰਾਮਦਾਸ ਹਰਿ ਸੋ ਮਿਲ ਗਏ ॥ ਗੁਰਤਾ ਦੇਤ ਅਰਜਨਿਹ ਭਏ ॥
ਜਬ ਅਰਜਨ ਪ੍ਰਭੁ ਲੋਕਿ ਸਿਧਾਏ ॥ ਹਰਿਗੋਬਿੰਦ ਤਿਹ ਠਾ ਠਹਰਾਏ ॥੧੧॥
ਹਰਿਗੋਬਿੰਦ ਪ੍ਰਭ ਲੋਕਿ ਸਿਧਾਰੇ ॥ ਹਰੀਰਾਇ ਤਹਿ ਠਾਂ ਬੈਠਾਰੇ ॥
ਹਰੀਕ੍ਰਿਸਨ ਤਿਨ ਕੇ ਸੁਤ ਵਏ ॥ ਤਿਨ ਤੇ ਤੇਗ ਬਹਾਦਰ ਭਏ ॥੧੨॥
Nanak transformed himself to Angad and spread Dharma in the world.
He was called Amar Das in the next transformation, a lamp was lit from the lamp.7.
When the opportune time came for the boon, then the Guru was called Ram Das.
The old boon was bestowed upon him, when Amar Das departed for the heavens.8.
Sri Nanak was recognized in Angad, and Angad in Amar Das.
Amar Das was called Ram Das, only the saints know it and the fools did not.9.
The people on the whole considered them as separate ones, but there were few who recognized them as one and the same.
Those who recognized them as One, they were successful on the spiritual plane. Without recognition there was no success.10.
When Ramdas merged in the Lord, the Guruship was bestowed upon Arjan.
When Arjan left for the abode of the Lord, Hargobind was seated on this throne.11.
When Hargobind left for the abode of the Lord, Har rai was seated in his place.
Har Krishan was his son; after him, Tegh Bahadur became the Guru.12. (Bachittar Natak, Sri Dasam Granth)