Rehit and its Composers : a Study

The following topic is taken as it is from another resource on internet.
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Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/sikh-sikhi-sikhism/1499-rehit-and-its-composers-a-study.html

I'd like to discuss the origin of Rehit and those who composed it. What were they influenced by, was it the Divine contact in which they composed the Rehits or was it the Circumstances that they were surounded by which influenced them?
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=1499

Are there Any Rehits which were written or spoken by the Gurus themselves?

If indeed it is a divine revelatino, then why do they differ from Jatha to SPGC to Akal Thakat. Why doesn't everyone Follow the Same Rehit. After all It is the Rehit which is given importence during the Amrit Sanchaar. Or can we say that as long as the basic Rehit of Amrit-vela, Meat and those related to the 5K's are kept it is enough?

Can the SGPC or the Akal Thakat make changes to the Rehit Maryada, such as add or remove certain Rehits?

Thanks, i apologize if the question are elementry as i know very little of Rehit and its real purpose. Also i hope this hasn't already been discussed.

 
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